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llvm/trunk/test/Transforms/SimplifyCFG/X86/speculate-cttz-ctlz.ll

; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+bmi < %s | FileCheck %s --check-prefix=ALL --check-prefix=BMI ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+bmi < %s | FileCheck %s --check-prefix=ALL --check-prefix=BMI
; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+lzcnt < %s | FileCheck %s --check-prefix=ALL --check-prefix=LZCNT ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+lzcnt < %s | FileCheck %s --check-prefix=ALL --check-prefix=LZCNT
; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown < %s | FileCheck %s --check-prefix=ALL --check-prefix=GENERIC ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown < %s | FileCheck %s --check-prefix=ALL --check-prefix=GENERIC
define i64 @test1(i64 %A) { define i64 @test1(i64 %A) {
; ALL-LABEL: @test1( ; ALL-LABEL: @test1(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true) ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
; LZCNT-NEXT: select i1 [[COND]], i64 64, i64 [[CTLZ]] ; ALL-NEXT: select i1 [[COND]], i64 64, i64 [[CTLZ]]
; BMI-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i64 %A, 0 %tobool = icmp eq i64 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true) %0 = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
br label %cond.end br label %cond.end
cond.end: ; preds = %entry, %cond.true cond.end: ; preds = %entry, %cond.true
%cond = phi i64 [ %0, %cond.true ], [ 64, %entry ] %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
ret i64 %cond ret i64 %cond
} }
define i32 @test2(i32 %A) { define i32 @test2(i32 %A) {
; ALL-LABEL: @test2( ; ALL-LABEL: @test2(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true) ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
; LZCNT-NEXT: select i1 [[COND]], i32 32, i32 [[CTLZ]] ; ALL-NEXT: select i1 [[COND]], i32 32, i32 [[CTLZ]]
; BMI-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i32 %A, 0 %tobool = icmp eq i32 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true) %0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
br label %cond.end br label %cond.end
cond.end: ; preds = %entry, %cond.true cond.end: ; preds = %entry, %cond.true
%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ] %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
ret i32 %cond ret i32 %cond
} }
define signext i16 @test3(i16 signext %A) { define signext i16 @test3(i16 signext %A) {
; ALL-LABEL: @test3( ; ALL-LABEL: @test3(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true) ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
; LZCNT-NEXT: select i1 [[COND]], i16 16, i16 [[CTLZ]] ; ALL-NEXT: select i1 [[COND]], i16 16, i16 [[CTLZ]]
; BMI-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i16 %A, 0 %tobool = icmp eq i16 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true) %0 = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
br label %cond.end br label %cond.end
cond.end: ; preds = %entry, %cond.true cond.end: ; preds = %entry, %cond.true
%cond = phi i16 [ %0, %cond.true ], [ 16, %entry ] %cond = phi i16 [ %0, %cond.true ], [ 16, %entry ]
ret i16 %cond ret i16 %cond
} }
define i64 @test1b(i64 %A) { define i64 @test1b(i64 %A) {
; ALL-LABEL: @test1b( ; ALL-LABEL: @test1b(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %A, i1 true) ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
; BMI-NEXT: select i1 [[COND]], i64 64, i64 [[CTTZ]] ; ALL-NEXT: select i1 [[COND]], i64 64, i64 [[CTTZ]]
; LZCNT-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i64 %A, 0 %tobool = icmp eq i64 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i64 @llvm.cttz.i64(i64 %A, i1 true) %0 = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
br label %cond.end br label %cond.end
cond.end: ; preds = %entry, %cond.true cond.end: ; preds = %entry, %cond.true
%cond = phi i64 [ %0, %cond.true ], [ 64, %entry ] %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
ret i64 %cond ret i64 %cond
} }
define i32 @test2b(i32 %A) { define i32 @test2b(i32 %A) {
; ALL-LABEL: @test2b( ; ALL-LABEL: @test2b(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true) ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
; BMI-NEXT: select i1 [[COND]], i32 32, i32 [[CTTZ]] ; ALL-NEXT: select i1 [[COND]], i32 32, i32 [[CTTZ]]
; LZCNT-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i32 %A, 0 %tobool = icmp eq i32 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true) %0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
br label %cond.end br label %cond.end
cond.end: ; preds = %entry, %cond.true cond.end: ; preds = %entry, %cond.true
%cond = phi i32 [ %0, %cond.true ], [ 32, %entry ] %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
ret i32 %cond ret i32 %cond
} }
define signext i16 @test3b(i16 signext %A) { define signext i16 @test3b(i16 signext %A) {
; ALL-LABEL: @test3b( ; ALL-LABEL: @test3b(
; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %A, i1 true) ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
; BMI-NEXT: select i1 [[COND]], i16 16, i16 [[CTTZ]] ; ALL-NEXT: select i1 [[COND]], i16 16, i16 [[CTTZ]]
; LZCNT-NOT: select
; GENERIC-NOT: select
; ALL: ret ; ALL: ret
entry: entry:
%tobool = icmp eq i16 %A, 0 %tobool = icmp eq i16 %A, 0
br i1 %tobool, label %cond.end, label %cond.true br i1 %tobool, label %cond.end, label %cond.true
cond.true: ; preds = %entry cond.true: ; preds = %entry
%0 = tail call i16 @llvm.cttz.i16(i16 %A, i1 true) %0 = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
br label %cond.end br label %cond.end
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