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Differential D52039

[PowerPC][NFC] Add a mulld testcase for scheduling check.
ClosedPublic

Authored by jsji on Sep 13 2018, 8:09 AM.

Details

Reviewers
hfinkel
nemanjai
stefanp
Commits
rGdf1a2d8d2baf: [PowerPC][NFC] Add a mulld testcase for scheduling check. This patch add a…
rL342440: [PowerPC][NFC] Add a mulld testcase for scheduling check.
Summary

This patch add a mulld testcase for scheduling check.

Currently P7/P8 which use itineraries are missing IIC_IntMulHD,
so they have different scheduling than P9.
We use CHECK-ITIN prefix to check P7/P8, then use default for P9 (and future).

We will fix the missing itineraries of IIC_IntMulHD in following patch, and update this testcase to show the difference.

Diff Detail

Repository
rL LLVM

Event Timeline

jsji created this revision.Sep 13 2018, 8:09 AM
nemanjai accepted this revision.Sep 14 2018, 2:23 AM

LGTM. For a change such as this, I like the idea of committing a test case prior to the patch so the patch clearly shows the difference. Thank you.

This revision is now accepted and ready to land.Sep 14 2018, 2:23 AM
Closed by commit rL342440: [PowerPC][NFC] Add a mulld testcase for scheduling check. (authored by • qshanz). · Explain WhySep 17 2018, 7:00 PM
This revision was automatically updated to reflect the committed changes.

Revision Contents

PathSize
llvm/
trunk/
test/
CodeGen/
PowerPC/
53 lines

Diff 165887

llvm/trunk/test/CodeGen/PowerPC/mulld.ll

; RUN: llc -verify-machineinstrs -mcpu=pwr9 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mcpu=pwr9 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
; RUN: llc -verify-machineinstrs -mcpu=pwr8 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s \
; RUN: --check-prefix=CHECK-ITIN
; RUN: llc -verify-machineinstrs -mcpu=pwr8 -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s \
; RUN: --check-prefix=CHECK-ITIN
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s \
; RUN: --check-prefix=CHECK-ITIN
define void @bn_mul_comba8(i64* nocapture %r, i64* nocapture readonly %a, i64* nocapture readonly %b) {
; CHECK-LABEL: bn_mul_comba8:
; CHECK: mulhdu
; CHECK-NEXT: mulld
; CHECK-NEXT: mulhdu
; CHECK-NEXT: mulld
; CHECK-NEXT: mulhdu
; CHECK-ITIN-LABEL: bn_mul_comba8:
; CHECK-ITIN: mulhdu
; CHECK-ITIN-NEXT: mulhdu
; CHECK-ITIN-NEXT: mulld
; CHECK-ITIN-NEXT: mulhdu
; CHECK-ITIN-NEXT: mulld
%1 = load i64, i64* %a, align 8
%conv = zext i64 %1 to i128
%2 = load i64, i64* %b, align 8
%conv2 = zext i64 %2 to i128
%mul = mul nuw i128 %conv2, %conv
%shr = lshr i128 %mul, 64
%agep = getelementptr inbounds i64, i64* %a, i64 1
%3 = load i64, i64* %agep, align 8
%conv14 = zext i64 %3 to i128
%mul15 = mul nuw i128 %conv14, %conv
%add17 = add i128 %mul15, %shr
%shr19 = lshr i128 %add17, 64
%conv20 = trunc i128 %shr19 to i64
%bgep = getelementptr inbounds i64, i64* %b, i64 1
%4 = load i64, i64* %bgep, align 8
%conv28 = zext i64 %4 to i128
%mul31 = mul nuw i128 %conv28, %conv2
%conv32 = and i128 %add17, 18446744073709551615
%add33 = add i128 %conv32, %mul31
%shr35 = lshr i128 %add33, 64
%conv36 = trunc i128 %shr35 to i64
%add37 = add i64 %conv36, %conv20
%cmp38 = icmp ult i64 %add37, %conv36
%conv148 = zext i1 %cmp38 to i64
store i64 %conv148, i64* %r, align 8
ret void
}