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Add tests to document current InstCombine behavior for clamp pattern.
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Authored by a.elovikov on Jun 19 2017, 8:00 AM.

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spatel
jmolloy

Commits

rG4ec1bb6f3916: Add tests to document current InstCombine behavior for clamp pattern.
rL306524: Add tests to document current InstCombine behavior for clamp pattern.

Summary

This commit adds the tests for clamp pattern as a prerequisite of
D33186 to make the impact of that fix more clear and also to document
current behavior.

Diff Detail

Repository: rL LLVM

Event Timeline

a.elovikov created this revision.Jun 19 2017, 8:00 AM

a.elovikov mentioned this in D33186: [InstCombine] Canonicalize clamp of float types to minmax in fast mode..Jun 19 2017, 8:26 AM

LGTM.

This revision is now accepted and ready to land.Jun 19 2017, 1:22 PM

a.elovikov added a child revision: D33186: [InstCombine] Canonicalize clamp of float types to minmax in fast mode..Jun 26 2017, 3:45 AM

Do you need someone to commit this for you?

In D34350#790466, @spatel wrote:

Do you need someone to commit this for you?

@n.bozhenov will commit it for me. However, I'm waiting for the D33186 to finish before committing this.

Closed by commit rL306524: Add tests to document current InstCombine behavior for clamp pattern. (authored by n.bozhenov). · Explain WhyJun 28 2017, 2:23 AM

This revision was automatically updated to reflect the committed changes.

Revision Contents

Path

Size

llvm/

trunk/

test/

Transforms/

InstCombine/

clamp-to-minmax.ll

500 lines

Diff 104364

llvm/trunk/test/Transforms/InstCombine/clamp-to-minmax.ll

				; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
				; RUN: opt < %s -instcombine -S \| FileCheck %s

				; (X < C1) ? C1 : MIN(X, C2)
				define float @clamp_float_fast_ordered_strict_maxmin(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_ordered_strict_maxmin(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast olt float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast olt float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp fast olt float %x, 1.0
				%r = select i1 %cmp1, float 1.0, float %min
				ret float %r
				}

				; (X <= C1) ? C1 : MIN(X, C2)
				define float @clamp_float_fast_ordered_nonstrict_maxmin(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_ordered_nonstrict_maxmin(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast ole float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast olt float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp fast ole float %x, 1.0
				%r = select i1 %cmp1, float 1.0, float %min
				ret float %r
				}

				; (X > C1) ? C1 : MAX(X, C2)
				define float @clamp_float_fast_ordered_strict_minmax(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_ordered_strict_minmax(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast ogt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ogt float %x, 1.0
				%max = select i1 %cmp2, float %x, float 1.0
				%cmp1 = fcmp fast ogt float %x, 255.0
				%r = select i1 %cmp1, float 255.0, float %max
				ret float %r
				}

				; (X >= C1) ? C1 : MAX(X, C2)
				define float @clamp_float_fast_ordered_nonstrict_minmax(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_ordered_nonstrict_minmax(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast oge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ogt float %x, 1.0
				%max = select i1 %cmp2, float %x, float 1.0
				%cmp1 = fcmp fast oge float %x, 255.0
				%r = select i1 %cmp1, float 255.0, float %max
				ret float %r
				}


				; The same for unordered

				; (X < C1) ? C1 : MIN(X, C2)
				define float @clamp_float_fast_unordered_strict_maxmin(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_unordered_strict_maxmin(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp fast oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast ult float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ult float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp fast ult float %x, 1.0
				%r = select i1 %cmp1, float 1.0, float %min
				ret float %r
				}

				; (X <= C1) ? C1 : MIN(X, C2)
				define float @clamp_float_fast_unordered_nonstrict_maxmin(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_unordered_nonstrict_maxmin(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp fast oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast ule float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ult float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp fast ule float %x, 1.0
				%r = select i1 %cmp1, float 1.0, float %min
				ret float %r
				}

				; (X > C1) ? C1 : MAX(X, C2)
				define float @clamp_float_fast_unordered_strict_minmax(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_unordered_strict_minmax(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp fast ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast ugt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ugt float %x, 1.0
				%max = select i1 %cmp2, float %x, float 1.0
				%cmp1 = fcmp fast ugt float %x, 255.0
				%r = select i1 %cmp1, float 255.0, float %max
				ret float %r
				}

				; (X >= C1) ? C1 : MAX(X, C2)
				define float @clamp_float_fast_unordered_nonstrict_minmax(float %x) {
				;
				; CHECK-LABEL: @clamp_float_fast_unordered_nonstrict_minmax(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp fast ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp fast uge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast ugt float %x, 1.0
				%max = select i1 %cmp2, float %x, float 1.0
				%cmp1 = fcmp fast uge float %x, 255.0
				%r = select i1 %cmp1, float 255.0, float %max
				ret float %r
				}

				; Some more checks with fast

				; (X > 1.0) ? min(x, 255.0) : 1.0
				define float @clamp_test_1(float %x) {
				; CHECK-LABEL: @clamp_test_1(
				; CHECK-NEXT: [[INNER_CMP_INV:%.]] = fcmp fast oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[INNER_SEL:%.*]] = select i1 [[INNER_CMP_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[OUTER_CMP:%.*]] = fcmp fast ugt float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[OUTER_CMP]], float [[INNER_SEL]], float 1.000000e+00
				; CHECK-NEXT: ret float [[R]]
				;
				%inner_cmp = fcmp fast ult float %x, 255.0
				%inner_sel = select i1 %inner_cmp, float %x, float 255.0
				%outer_cmp = fcmp fast ugt float %x, 1.0
				%r = select i1 %outer_cmp, float %inner_sel, float 1.0
				ret float %r
				}

				; And something negative

				; Like @clamp_test_1 but HighConst < LowConst
				define float @clamp_negative_wrong_const(float %x) {
				; CHECK-LABEL: @clamp_negative_wrong_const(
				; CHECK-NEXT: [[INNER_CMP_INV:%.]] = fcmp fast oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[INNER_SEL:%.*]] = select i1 [[INNER_CMP_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[OUTER_CMP:%.*]] = fcmp fast ugt float [[X]], 5.120000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[OUTER_CMP]], float [[INNER_SEL]], float 5.120000e+02
				; CHECK-NEXT: ret float [[R]]
				;
				%inner_cmp = fcmp fast ult float %x, 255.0
				%inner_sel = select i1 %inner_cmp, float %x, float 255.0
				%outer_cmp = fcmp fast ugt float %x, 512.0
				%r = select i1 %outer_cmp, float %inner_sel, float 512.0
				ret float %r
				}

				; Like @clamp_test_1 but both are min
				define float @clamp_negative_same_op(float %x) {
				; CHECK-LABEL: @clamp_negative_same_op(
				; CHECK-NEXT: [[INNER_CMP_INV:%.]] = fcmp fast oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[INNER_SEL:%.*]] = select i1 [[INNER_CMP_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[OUTER_CMP:%.*]] = fcmp fast ult float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[OUTER_CMP]], float [[INNER_SEL]], float 1.000000e+00
				; CHECK-NEXT: ret float [[R]]
				;
				%inner_cmp = fcmp fast ult float %x, 255.0
				%inner_sel = select i1 %inner_cmp, float %x, float 255.0
				%outer_cmp = fcmp fast ult float %x, 1.0
				%r = select i1 %outer_cmp, float %inner_sel, float 1.0
				ret float %r
				}


				; And now without fast.

				; First, check that we don't do bad things in the presence of signed zeros
				define float @clamp_float_with_zero1(float %x) {
				; CHECK-LABEL: @clamp_float_with_zero1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ole float [[X]], 0.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 0.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast olt float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp ole float %x, 0.0
				%r = select i1 %cmp1, float 0.0, float %min
				ret float %r
				}

				define float @clamp_float_with_zero2(float %x) {
				; CHECK-LABEL: @clamp_float_with_zero2(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp fast olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp olt float [[X]], 0.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 0.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp fast olt float %x, 255.0
				%min = select i1 %cmp2, float %x, float 255.0
				%cmp1 = fcmp olt float %x, 0.0
				%r = select i1 %cmp1, float 0.0, float %min
				ret float %r
				}

				; Also, here we care more about the ordering of the inner min/max, so
				; two times more cases.
				; TODO: that is not implemented yet, so these checks are for the
				; future. This means that checks below can just check that
				; "fcmp.*%x" happens twice for each label.

				; (X < C1) ? C1 : MIN(X, C2)
				define float @clamp_float_ordered_strict_maxmin1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_strict_maxmin1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp olt float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp olt float %x, 255.0 ; X is NaN => false
				%min = select i1 %cmp2, float %x, float 255.0 ; 255.0
				%cmp1 = fcmp olt float %x, 1.0 ; false
				%r = select i1 %cmp1, float 1.0, float %min ; min (255.0)
				ret float %r
				}

				define float @clamp_float_ordered_strict_maxmin2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_strict_maxmin2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp olt float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ult float %x, 255.0 ; X is NaN => true
				%min = select i1 %cmp2, float %x, float 255.0 ; NaN
				%cmp1 = fcmp olt float %x, 1.0 ; false
				%r = select i1 %cmp1, float 1.0, float %min ; min (NaN)
				ret float %r
				}

				; (X <= C1) ? C1 : MIN(X, C2)
				define float @clamp_float_ordered_nonstrict_maxmin1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_nonstrict_maxmin1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ole float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp olt float %x, 255.0 ; X is NaN => false
				%min = select i1 %cmp2, float %x, float 255.0 ; 255.0
				%cmp1 = fcmp ole float %x, 1.0 ; false
				%r = select i1 %cmp1, float 1.0, float %min ; min (255.0)
				ret float %r
				}

				define float @clamp_float_ordered_nonstrict_maxmin2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_nonstrict_maxmin2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ole float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ult float %x, 255.0 ; x is NaN => true
				%min = select i1 %cmp2, float %x, float 255.0 ; NaN
				%cmp1 = fcmp ole float %x, 1.0 ; false
				%r = select i1 %cmp1, float 1.0, float %min ; min (NaN)
				ret float %r
				}

				; (X > C1) ? C1 : MAX(X, C2)
				define float @clamp_float_ordered_strict_minmax1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_strict_minmax1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ogt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ogt float %x, 1.0 ; x is NaN => false
				%max = select i1 %cmp2, float %x, float 1.0 ; 1.0
				%cmp1 = fcmp ogt float %x, 255.0 ; false
				%r = select i1 %cmp1, float 255.0, float %max ; max (1.0)
				ret float %r
				}

				define float @clamp_float_ordered_strict_minmax2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_strict_minmax2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ogt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ugt float %x, 1.0 ; x is NaN => true
				%max = select i1 %cmp2, float %x, float 1.0 ; NaN
				%cmp1 = fcmp ogt float %x, 255.0 ; false
				%r = select i1 %cmp1, float 255.0, float %max ; max (NaN)
				ret float %r
				}

				; (X >= C1) ? C1 : MAX(X, C2)
				define float @clamp_float_ordered_nonstrict_minmax1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_nonstrict_minmax1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp oge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ogt float %x, 1.0 ; x is NaN => false
				%max = select i1 %cmp2, float %x, float 1.0 ; 1.0
				%cmp1 = fcmp oge float %x, 255.0 ; false
				%r = select i1 %cmp1, float 255.0, float %max ; max (1.0)
				ret float %r
				}

				define float @clamp_float_ordered_nonstrict_minmax2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_ordered_nonstrict_minmax2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp oge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ugt float %x, 1.0 ; x is NaN => true
				%max = select i1 %cmp2, float %x, float 1.0 ; NaN
				%cmp1 = fcmp oge float %x, 255.0 ; false
				%r = select i1 %cmp1, float 255.0, float %max ; max (NaN)
				ret float %r
				}


				; The same for unordered

				; (X < C1) ? C1 : MIN(X, C2)
				define float @clamp_float_unordered_strict_maxmin1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_strict_maxmin1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ult float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp olt float %x, 255.0 ; x is NaN => false
				%min = select i1 %cmp2, float %x, float 255.0 ; 255.0
				%cmp1 = fcmp ult float %x, 1.0 ; true
				%r = select i1 %cmp1, float 1.0, float %min ; 1.0
				ret float %r
				}

				define float @clamp_float_unordered_strict_maxmin2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_strict_maxmin2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ult float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ult float %x, 255.0 ; x is NaN => true
				%min = select i1 %cmp2, float %x, float 255.0 ; NaN
				%cmp1 = fcmp ult float %x, 1.0 ; true
				%r = select i1 %cmp1, float 1.0, float %min ; 1.0
				ret float %r
				}

				; (X <= C1) ? C1 : MIN(X, C2)
				define float @clamp_float_unordered_nonstrict_maxmin1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_nonstrict_maxmin1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp olt float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2]], float [[X]], float 2.550000e+02
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ule float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp olt float %x, 255.0 ; x is NaN => false
				%min = select i1 %cmp2, float %x, float 255.0 ; 255.0
				%cmp1 = fcmp ule float %x, 1.0 ; true
				%r = select i1 %cmp1, float 1.0, float %min ; 1.0
				ret float %r
				}

				define float @clamp_float_unordered_nonstrict_maxmin2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_nonstrict_maxmin2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp oge float [[X:%.]], 2.550000e+02
				; CHECK-NEXT: [[MIN:%.*]] = select i1 [[CMP2_INV]], float 2.550000e+02, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ule float [[X]], 1.000000e+00
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 1.000000e+00, float [[MIN]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ult float %x, 255.0 ; x is NaN => true
				%min = select i1 %cmp2, float %x, float 255.0 ; NaN
				%cmp1 = fcmp ule float %x, 1.0 ; true
				%r = select i1 %cmp1, float 1.0, float %min ; 1.0
				ret float %r
				}

				; (X > C1) ? C1 : MAX(X, C2)
				define float @clamp_float_unordered_strict_minmax1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_strict_minmax1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ugt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ogt float %x, 1.0 ; x is NaN => false
				%max = select i1 %cmp2, float %x, float 1.0 ; 1.0
				%cmp1 = fcmp ugt float %x, 255.0 ; true
				%r = select i1 %cmp1, float 255.0, float %max ; 255.0
				ret float %r
				}

				define float @clamp_float_unordered_strict_minmax2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_strict_minmax2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp ugt float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ugt float %x, 1.0 ; x is NaN => true
				%max = select i1 %cmp2, float %x, float 1.0 ; NaN
				%cmp1 = fcmp ugt float %x, 255.0 ; true
				%r = select i1 %cmp1, float 255.0, float %max ; 255.0
				ret float %r
				}

				; (X >= C1) ? C1 : MAX(X, C2)
				define float @clamp_float_unordered_nonstrict_minmax1(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_nonstrict_minmax1(
				; CHECK-NEXT: [[CMP2:%.]] = fcmp ogt float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2]], float [[X]], float 1.000000e+00
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp uge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ogt float %x, 1.0 ; x is NaN => false
				%max = select i1 %cmp2, float %x, float 1.0 ; 1.0
				%cmp1 = fcmp uge float %x, 255.0 ; true
				%r = select i1 %cmp1, float 255.0, float %max ; 255.0
				ret float %r
				}

				define float @clamp_float_unordered_nonstrict_minmax2(float %x) {
				;
				; CHECK-LABEL: @clamp_float_unordered_nonstrict_minmax2(
				; CHECK-NEXT: [[CMP2_INV:%.]] = fcmp ole float [[X:%.]], 1.000000e+00
				; CHECK-NEXT: [[MAX:%.*]] = select i1 [[CMP2_INV]], float 1.000000e+00, float [[X]]
				; CHECK-NEXT: [[CMP1:%.*]] = fcmp uge float [[X]], 2.550000e+02
				; CHECK-NEXT: [[R:%.*]] = select i1 [[CMP1]], float 2.550000e+02, float [[MAX]]
				; CHECK-NEXT: ret float [[R]]
				;
				%cmp2 = fcmp ugt float %x, 1.0 ; x is NaN => true
				%max = select i1 %cmp2, float %x, float 1.0 ; NaN
				%cmp1 = fcmp uge float %x, 255.0 ; true
				%r = select i1 %cmp1, float 255.0, float %max ; 255.0
				ret float %r
				}