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[LoopStrengthReduce] add test to show potential macro-fusion-based diff (PR35681); NFC
This is the baseline output for the test proposed with D42607. llvm-svn: 323806
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Sanjay Patel
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70d24ebde0
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7385746655
126
test/Transforms/LoopStrengthReduce/X86/macro-fuse-cmp.ll
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126
test/Transforms/LoopStrengthReduce/X86/macro-fuse-cmp.ll
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: opt < %s -loop-reduce -mcpu=btver2 -S | FileCheck %s --check-prefix=JAG
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; RUN: opt < %s -loop-reduce -mcpu=haswell -S | FileCheck %s --check-prefix=HSW
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; RUN: llc < %s | FileCheck %s --check-prefix=BASE
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; RUN: llc < %s -mattr=macrofusion | FileCheck %s --check-prefix=FUSE
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-unknown"
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; PR35681 - https://bugs.llvm.org/show_bug.cgi?id=35681
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; FIXME: If a CPU can macro-fuse a compare and branch, then we discount that
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; cost in LSR and avoid generating large offsets in each memory access.
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; This reduces code size and may improve decode throughput.
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define void @maxArray(double* noalias nocapture %x, double* noalias nocapture readonly %y) {
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; JAG-LABEL: @maxArray(
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; JAG-NEXT: entry:
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; JAG-NEXT: [[Y1:%.*]] = bitcast double* [[Y:%.*]] to <2 x double>*
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; JAG-NEXT: [[X4:%.*]] = bitcast double* [[X:%.*]] to <2 x double>*
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; JAG-NEXT: [[X45:%.*]] = bitcast <2 x double>* [[X4]] to i8*
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; JAG-NEXT: [[Y12:%.*]] = bitcast <2 x double>* [[Y1]] to i8*
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; JAG-NEXT: br label [[VECTOR_BODY:%.*]]
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; JAG: vector.body:
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; JAG-NEXT: [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[VECTOR_BODY]] ], [ -524288, [[ENTRY:%.*]] ]
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; JAG-NEXT: [[UGLYGEP9:%.*]] = getelementptr i8, i8* [[X45]], i64 [[LSR_IV]]
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; JAG-NEXT: [[UGLYGEP910:%.*]] = bitcast i8* [[UGLYGEP9]] to <2 x double>*
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; JAG-NEXT: [[SCEVGEP11:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP910]], i64 32768
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; JAG-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, i8* [[Y12]], i64 [[LSR_IV]]
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; JAG-NEXT: [[UGLYGEP3:%.*]] = bitcast i8* [[UGLYGEP]] to <2 x double>*
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; JAG-NEXT: [[SCEVGEP:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP3]], i64 32768
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; JAG-NEXT: [[XVAL:%.*]] = load <2 x double>, <2 x double>* [[SCEVGEP11]], align 8
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; JAG-NEXT: [[YVAL:%.*]] = load <2 x double>, <2 x double>* [[SCEVGEP]], align 8
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; JAG-NEXT: [[CMP:%.*]] = fcmp ogt <2 x double> [[YVAL]], [[XVAL]]
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; JAG-NEXT: [[MAX:%.*]] = select <2 x i1> [[CMP]], <2 x double> [[YVAL]], <2 x double> [[XVAL]]
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; JAG-NEXT: [[UGLYGEP6:%.*]] = getelementptr i8, i8* [[X45]], i64 [[LSR_IV]]
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; JAG-NEXT: [[UGLYGEP67:%.*]] = bitcast i8* [[UGLYGEP6]] to <2 x double>*
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; JAG-NEXT: [[SCEVGEP8:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP67]], i64 32768
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; JAG-NEXT: store <2 x double> [[MAX]], <2 x double>* [[SCEVGEP8]], align 8
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; JAG-NEXT: [[LSR_IV_NEXT]] = add nsw i64 [[LSR_IV]], 16
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; JAG-NEXT: [[DONE:%.*]] = icmp eq i64 [[LSR_IV_NEXT]], 0
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; JAG-NEXT: br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
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; JAG: exit:
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; JAG-NEXT: ret void
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;
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; HSW-LABEL: @maxArray(
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; HSW-NEXT: entry:
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; HSW-NEXT: [[Y1:%.*]] = bitcast double* [[Y:%.*]] to <2 x double>*
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; HSW-NEXT: [[X4:%.*]] = bitcast double* [[X:%.*]] to <2 x double>*
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; HSW-NEXT: [[X45:%.*]] = bitcast <2 x double>* [[X4]] to i8*
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; HSW-NEXT: [[Y12:%.*]] = bitcast <2 x double>* [[Y1]] to i8*
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; HSW-NEXT: br label [[VECTOR_BODY:%.*]]
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; HSW: vector.body:
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; HSW-NEXT: [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[VECTOR_BODY]] ], [ -524288, [[ENTRY:%.*]] ]
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; HSW-NEXT: [[UGLYGEP9:%.*]] = getelementptr i8, i8* [[X45]], i64 [[LSR_IV]]
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; HSW-NEXT: [[UGLYGEP910:%.*]] = bitcast i8* [[UGLYGEP9]] to <2 x double>*
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; HSW-NEXT: [[SCEVGEP11:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP910]], i64 32768
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; HSW-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, i8* [[Y12]], i64 [[LSR_IV]]
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; HSW-NEXT: [[UGLYGEP3:%.*]] = bitcast i8* [[UGLYGEP]] to <2 x double>*
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; HSW-NEXT: [[SCEVGEP:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP3]], i64 32768
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; HSW-NEXT: [[XVAL:%.*]] = load <2 x double>, <2 x double>* [[SCEVGEP11]], align 8
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; HSW-NEXT: [[YVAL:%.*]] = load <2 x double>, <2 x double>* [[SCEVGEP]], align 8
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; HSW-NEXT: [[CMP:%.*]] = fcmp ogt <2 x double> [[YVAL]], [[XVAL]]
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; HSW-NEXT: [[MAX:%.*]] = select <2 x i1> [[CMP]], <2 x double> [[YVAL]], <2 x double> [[XVAL]]
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; HSW-NEXT: [[UGLYGEP6:%.*]] = getelementptr i8, i8* [[X45]], i64 [[LSR_IV]]
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; HSW-NEXT: [[UGLYGEP67:%.*]] = bitcast i8* [[UGLYGEP6]] to <2 x double>*
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; HSW-NEXT: [[SCEVGEP8:%.*]] = getelementptr <2 x double>, <2 x double>* [[UGLYGEP67]], i64 32768
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; HSW-NEXT: store <2 x double> [[MAX]], <2 x double>* [[SCEVGEP8]], align 8
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; HSW-NEXT: [[LSR_IV_NEXT]] = add nsw i64 [[LSR_IV]], 16
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; HSW-NEXT: [[DONE:%.*]] = icmp eq i64 [[LSR_IV_NEXT]], 0
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; HSW-NEXT: br i1 [[DONE]], label [[EXIT:%.*]], label [[VECTOR_BODY]]
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; HSW: exit:
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; HSW-NEXT: ret void
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;
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; BASE-LABEL: maxArray:
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; BASE: # %bb.0: # %entry
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; BASE-NEXT: movq $-524288, %rax # imm = 0xFFF80000
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; BASE-NEXT: .p2align 4, 0x90
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; BASE-NEXT: .LBB0_1: # %vector.body
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; BASE-NEXT: # =>This Inner Loop Header: Depth=1
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; BASE-NEXT: movupd 524288(%rdi,%rax), %xmm0
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; BASE-NEXT: movupd 524288(%rsi,%rax), %xmm1
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; BASE-NEXT: maxpd %xmm0, %xmm1
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; BASE-NEXT: movupd %xmm1, 524288(%rdi,%rax)
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; BASE-NEXT: addq $16, %rax
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; BASE-NEXT: jne .LBB0_1
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; BASE-NEXT: # %bb.2: # %exit
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; BASE-NEXT: retq
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;
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; FUSE-LABEL: maxArray:
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; FUSE: # %bb.0: # %entry
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; FUSE-NEXT: movq $-524288, %rax # imm = 0xFFF80000
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; FUSE-NEXT: .p2align 4, 0x90
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; FUSE-NEXT: .LBB0_1: # %vector.body
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; FUSE-NEXT: # =>This Inner Loop Header: Depth=1
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; FUSE-NEXT: movupd 524288(%rdi,%rax), %xmm0
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; FUSE-NEXT: movupd 524288(%rsi,%rax), %xmm1
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; FUSE-NEXT: maxpd %xmm0, %xmm1
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; FUSE-NEXT: movupd %xmm1, 524288(%rdi,%rax)
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; FUSE-NEXT: addq $16, %rax
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; FUSE-NEXT: jne .LBB0_1
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; FUSE-NEXT: # %bb.2: # %exit
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; FUSE-NEXT: retq
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entry:
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br label %vector.body
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vector.body:
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%index = phi i64 [ 0, %entry ], [ %index.next, %vector.body ]
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%gepx = getelementptr inbounds double, double* %x, i64 %index
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%gepy = getelementptr inbounds double, double* %y, i64 %index
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%xptr = bitcast double* %gepx to <2 x double>*
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%yptr = bitcast double* %gepy to <2 x double>*
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%xval = load <2 x double>, <2 x double>* %xptr, align 8
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%yval = load <2 x double>, <2 x double>* %yptr, align 8
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%cmp = fcmp ogt <2 x double> %yval, %xval
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%max = select <2 x i1> %cmp, <2 x double> %yval, <2 x double> %xval
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%xptr_again = bitcast double* %gepx to <2 x double>*
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store <2 x double> %max, <2 x double>* %xptr_again, align 8
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%index.next = add i64 %index, 2
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%done = icmp eq i64 %index.next, 65536
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br i1 %done, label %exit, label %vector.body
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exit:
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ret void
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}
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