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[InstCombine] Add tests for PR44242
Differential Revision: https://reviews.llvm.org/D71260
This commit is contained in:
Connor Abbott
Nikita Popov
parent
db322087e9
commit
af2e9a3297
192
test/Transforms/InstCombine/pr44242.ll
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192
test/Transforms/InstCombine/pr44242.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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; Check that we don't create two redundant phi nodes when %val is used in a
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; form where we can't rewrite it in terms of the new phi node.
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; Use %val in an instruction type not supported by optimizeBitCastFromPhi.
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define float @sitofp(float %x) {
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; CHECK-LABEL: @sitofp(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop_header:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[VAL_INCR:%.*]], [[LOOP:%.*]] ]
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; CHECK-NEXT: [[VAL:%.*]] = phi float [ 0.000000e+00, [[ENTRY]] ], [ [[PHITMP:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[CMP:%.*]] = fcmp ogt float [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[LOOP]]
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; CHECK: loop:
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; CHECK-NEXT: [[VAL_INCR]] = fadd float [[TMP0]], 1.000000e+00
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; CHECK-NEXT: [[VAL_INCR_CASTED:%.*]] = bitcast float [[VAL_INCR]] to i32
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; CHECK-NEXT: [[PHITMP]] = sitofp i32 [[VAL_INCR_CASTED]] to float
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; CHECK-NEXT: br label [[LOOP_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: ret float [[VAL]]
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;
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entry:
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br label %loop_header
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loop_header:
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%val = phi i32 [ 0, %entry ], [ %val_incr_casted, %loop ]
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%val_casted = bitcast i32 %val to float
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%cmp = fcmp ogt float %val_casted, %x
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br i1 %cmp, label %end, label %loop
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loop:
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%val_incr = fadd float %val_casted, 1.0
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%val_incr_casted = bitcast float %val_incr to i32
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br label %loop_header
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end:
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%result = sitofp i32 %val to float
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ret float %result
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}
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; Use %val in an incompatible bitcast.
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define <2 x i16> @bitcast(float %x) {
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; CHECK-LABEL: @bitcast(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop_header:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[VAL_INCR:%.*]], [[LOOP:%.*]] ]
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; CHECK-NEXT: [[VAL:%.*]] = phi <2 x i16> [ zeroinitializer, [[ENTRY]] ], [ [[PHITMP:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[CMP:%.*]] = fcmp ogt float [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[LOOP]]
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; CHECK: loop:
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; CHECK-NEXT: [[VAL_INCR]] = fadd float [[TMP0]], 1.000000e+00
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; CHECK-NEXT: [[PHITMP]] = bitcast float [[VAL_INCR]] to <2 x i16>
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; CHECK-NEXT: br label [[LOOP_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: ret <2 x i16> [[VAL]]
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;
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entry:
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br label %loop_header
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loop_header:
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%val = phi i32 [ 0, %entry ], [ %val_incr_casted, %loop ]
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%val_casted = bitcast i32 %val to float
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%cmp = fcmp ogt float %val_casted, %x
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br i1 %cmp, label %end, label %loop
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loop:
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%val_incr = fadd float %val_casted, 1.0
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%val_incr_casted = bitcast float %val_incr to i32
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br label %loop_header
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end:
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%result = bitcast i32 %val to <2 x i16>
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ret <2 x i16> %result
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}
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@global = global i32 0
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; Use %val with a volatile store.
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define void @store_volatile(float %x) {
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; CHECK-LABEL: @store_volatile(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop_header:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[VAL_INCR:%.*]], [[LOOP:%.*]] ]
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; CHECK-NEXT: [[VAL:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[VAL_INCR_CASTED:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[CMP:%.*]] = fcmp ogt float [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[LOOP]]
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; CHECK: loop:
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; CHECK-NEXT: [[VAL_INCR]] = fadd float [[TMP0]], 1.000000e+00
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; CHECK-NEXT: [[VAL_INCR_CASTED]] = bitcast float [[VAL_INCR]] to i32
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; CHECK-NEXT: br label [[LOOP_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: store volatile i32 [[VAL]], i32* @global, align 4
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop_header
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loop_header:
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%val = phi i32 [ 0, %entry ], [ %val_incr_casted, %loop ]
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%val_casted = bitcast i32 %val to float
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%cmp = fcmp ogt float %val_casted, %x
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br i1 %cmp, label %end, label %loop
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loop:
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%val_incr = fadd float %val_casted, 1.0
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%val_incr_casted = bitcast float %val_incr to i32
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br label %loop_header
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end:
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store volatile i32 %val, i32* @global
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ret void
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}
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; Use %val with a store where it's actually the address.
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define void @store_address(i32 %x) {
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; CHECK-LABEL: @store_address(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop_header:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float* [ bitcast (i32* @global to float*), [[ENTRY:%.*]] ], [ [[VAL_INCR:%.*]], [[LOOP:%.*]] ]
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; CHECK-NEXT: [[VAL:%.*]] = phi i32* [ @global, [[ENTRY]] ], [ [[VAL_INCR_CASTED:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[X:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[LOOP]]
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; CHECK: loop:
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; CHECK-NEXT: [[VAL_INCR]] = getelementptr float, float* [[TMP0]], i64 1
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; CHECK-NEXT: [[VAL_INCR_CASTED]] = bitcast float* [[VAL_INCR]] to i32*
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; CHECK-NEXT: br label [[LOOP_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: store i32 0, i32* [[VAL]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop_header
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loop_header:
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%val = phi i32* [ @global, %entry ], [ %val_incr_casted, %loop ]
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%i = phi i32 [ 0, %entry ], [ %i_incr, %loop ]
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%val_casted = bitcast i32* %val to float*
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%cmp = icmp sgt i32 %i, %x
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br i1 %cmp, label %end, label %loop
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loop:
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%i_incr = add i32 %i, 0
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%val_incr = getelementptr float, float* %val_casted, i32 1
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%val_incr_casted = bitcast float* %val_incr to i32*
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br label %loop_header
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end:
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store i32 0, i32* %val
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ret void
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}
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; Test where a phi (%val2) other than the original one (%val) has an
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; incompatible use.
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define i32 @multiple_phis(float %x) {
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; CHECK-LABEL: @multiple_phis(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP_HEADER:%.*]]
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; CHECK: loop_header:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[TMP1:%.*]], [[LOOP_END:%.*]] ]
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; CHECK-NEXT: [[VAL:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[VAL2:%.*]], [[LOOP_END]] ]
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; CHECK-NEXT: [[CMP:%.*]] = fcmp ogt float [[TMP0]], [[X:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[CMP2:%.*]] = fcmp ogt float [[TMP0]], 2.000000e+00
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; CHECK-NEXT: br i1 [[CMP2]], label [[IF:%.*]], label [[LOOP_END]]
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; CHECK: if:
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; CHECK-NEXT: [[VAL_INCR:%.*]] = fadd float [[TMP0]], 1.000000e+00
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; CHECK-NEXT: [[VAL_INCR_CASTED:%.*]] = bitcast float [[VAL_INCR]] to i32
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; CHECK-NEXT: br label [[LOOP_END]]
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; CHECK: loop_end:
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; CHECK-NEXT: [[TMP1]] = phi float [ [[TMP0]], [[LOOP]] ], [ [[VAL_INCR]], [[IF]] ]
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; CHECK-NEXT: [[VAL2]] = phi i32 [ [[VAL]], [[LOOP]] ], [ [[VAL_INCR_CASTED]], [[IF]] ]
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; CHECK-NEXT: store volatile i32 [[VAL2]], i32* @global, align 4
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; CHECK-NEXT: br label [[LOOP_HEADER]]
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; CHECK: end:
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; CHECK-NEXT: ret i32 [[VAL]]
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;
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entry:
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br label %loop_header
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loop_header:
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%val = phi i32 [ 0, %entry ], [ %val2, %loop_end ]
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%val_casted = bitcast i32 %val to float
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%cmp = fcmp ogt float %val_casted, %x
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br i1 %cmp, label %end, label %loop
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loop:
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%cmp2 = fcmp ogt float %val_casted, 2.0
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br i1 %cmp2, label %if, label %loop_end
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if:
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%val_incr = fadd float %val_casted, 1.0
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%val_incr_casted = bitcast float %val_incr to i32
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br label %loop_end
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loop_end:
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%val2 = phi i32 [ %val, %loop ], [ %val_incr_casted, %if ]
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store volatile i32 %val2, i32* @global ; the incompatible use
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br label %loop_header
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end:
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ret i32 %val
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}
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