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Revert "[Float2Int] Resolve FIXME: Pick the smallest legal type that …
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…fits" (llvm#85843)

Reverts llvm#79158, which causes a miscompile. See
llvm#79158 (comment)
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@alexfh
alexfh authored Mar 19, 2024
1 parent 28c1279 commit a6e231b
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Showing 3 changed files with 68 additions and 214 deletions.
2 changes: 1 addition & 1 deletion llvm/include/llvm/Transforms/Scalar/Float2Int.h
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@ class Float2IntPass : public PassInfoMixin<Float2IntPass> {
std::optional<ConstantRange> calcRange(Instruction *I);
void walkBackwards();
void walkForwards();
bool validateAndTransform(const DataLayout &DL);
bool validateAndTransform();
Value *convert(Instruction *I, Type *ToTy);
void cleanup();

Expand Down
29 changes: 10 additions & 19 deletions llvm/lib/Transforms/Scalar/Float2Int.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -311,7 +311,7 @@ void Float2IntPass::walkForwards() {
}

// If there is a valid transform to be done, do it.
bool Float2IntPass::validateAndTransform(const DataLayout &DL) {
bool Float2IntPass::validateAndTransform() {
bool MadeChange = false;

// Iterate over every disjoint partition of the def-use graph.
Expand Down Expand Up @@ -376,24 +376,16 @@ bool Float2IntPass::validateAndTransform(const DataLayout &DL) {
LLVM_DEBUG(dbgs() << "F2I: Value not guaranteed to be representable!\n");
continue;
}

// OK, R is known to be representable.
// Pick the smallest legal type that will fit.
Type *Ty = DL.getSmallestLegalIntType(*Ctx, MinBW);
if (!Ty) {
// Every supported target supports 64-bit and 32-bit integers,
// so fallback to a 32 or 64-bit integer if the value fits.
if (MinBW <= 32) {
Ty = Type::getInt32Ty(*Ctx);
} else if (MinBW <= 64) {
Ty = Type::getInt64Ty(*Ctx);
} else {
LLVM_DEBUG(dbgs() << "F2I: Value requires more than bits to represent "
"than the target supports!\n");
continue;
}
if (MinBW > 64) {
LLVM_DEBUG(
dbgs() << "F2I: Value requires more than 64 bits to represent!\n");
continue;
}

// OK, R is known to be representable. Now pick a type for it.
// FIXME: Pick the smallest legal type that will fit.
Type *Ty = (MinBW > 32) ? Type::getInt64Ty(*Ctx) : Type::getInt32Ty(*Ctx);

for (auto MI = ECs.member_begin(It), ME = ECs.member_end();
MI != ME; ++MI)
convert(*MI, Ty);
Expand Down Expand Up @@ -499,8 +491,7 @@ bool Float2IntPass::runImpl(Function &F, const DominatorTree &DT) {
walkBackwards();
walkForwards();

const DataLayout &DL = F.getParent()->getDataLayout();
bool Modified = validateAndTransform(DL);
bool Modified = validateAndTransform();
if (Modified)
cleanup();
return Modified;
Expand Down
251 changes: 57 additions & 194 deletions llvm/test/Transforms/Float2Int/basic.ll
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Original file line number Diff line number Diff line change
@@ -1,29 +1,16 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=float2int -S | FileCheck %s -check-prefixes=CHECK,NONE
; RUN: opt < %s -passes=float2int -S --data-layout="n64" | FileCheck %s -check-prefixes=CHECK,ONLY64
; RUN: opt < %s -passes=float2int -S --data-layout="n8:16:32:64"| FileCheck %s -check-prefixes=CHECK,MULTIPLE
; RUN: opt < %s -passes='float2int' -S | FileCheck %s

;
; Positive tests
;

define i16 @simple1(i8 %a) {
; NONE-LABEL: @simple1(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[T21:%.*]] = add i32 [[TMP1]], 1
; NONE-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; NONE-NEXT: ret i16 [[TMP2]]
;
; ONLY64-LABEL: @simple1(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[T21:%.*]] = add i64 [[TMP1]], 1
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[T21]] to i16
; ONLY64-NEXT: ret i16 [[TMP2]]
;
; MULTIPLE-LABEL: @simple1(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[T21:%.*]] = add i16 [[TMP1]], 1
; MULTIPLE-NEXT: ret i16 [[T21]]
; CHECK-LABEL: @simple1(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[T21:%.*]] = add i32 [[TMP1]], 1
; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; CHECK-NEXT: ret i16 [[TMP2]]
;
%t1 = uitofp i8 %a to float
%t2 = fadd float %t1, 1.0
Expand All @@ -32,23 +19,11 @@ define i16 @simple1(i8 %a) {
}

define i8 @simple2(i8 %a) {
; NONE-LABEL: @simple2(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[T21:%.*]] = sub i32 [[TMP1]], 1
; NONE-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i8
; NONE-NEXT: ret i8 [[TMP2]]
;
; ONLY64-LABEL: @simple2(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[T21:%.*]] = sub i64 [[TMP1]], 1
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[T21]] to i8
; ONLY64-NEXT: ret i8 [[TMP2]]
;
; MULTIPLE-LABEL: @simple2(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[T21:%.*]] = sub i16 [[TMP1]], 1
; MULTIPLE-NEXT: [[TMP2:%.*]] = trunc i16 [[T21]] to i8
; MULTIPLE-NEXT: ret i8 [[TMP2]]
; CHECK-LABEL: @simple2(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[T21:%.*]] = sub i32 [[TMP1]], 1
; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i8
; CHECK-NEXT: ret i8 [[TMP2]]
;
%t1 = uitofp i8 %a to float
%t2 = fsub float %t1, 1.0
Expand All @@ -57,22 +32,10 @@ define i8 @simple2(i8 %a) {
}

define i32 @simple3(i8 %a) {
; NONE-LABEL: @simple3(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[T21:%.*]] = sub i32 [[TMP1]], 1
; NONE-NEXT: ret i32 [[T21]]
;
; ONLY64-LABEL: @simple3(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[T21:%.*]] = sub i64 [[TMP1]], 1
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[T21]] to i32
; ONLY64-NEXT: ret i32 [[TMP2]]
;
; MULTIPLE-LABEL: @simple3(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[T21:%.*]] = sub i16 [[TMP1]], 1
; MULTIPLE-NEXT: [[TMP2:%.*]] = zext i16 [[T21]] to i32
; MULTIPLE-NEXT: ret i32 [[TMP2]]
; CHECK-LABEL: @simple3(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[T21:%.*]] = sub i32 [[TMP1]], 1
; CHECK-NEXT: ret i32 [[T21]]
;
%t1 = uitofp i8 %a to float
%t2 = fsub float %t1, 1.0
Expand All @@ -81,23 +44,11 @@ define i32 @simple3(i8 %a) {
}

define i1 @cmp(i8 %a, i8 %b) {
; NONE-LABEL: @cmp(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; NONE-NEXT: [[T31:%.*]] = icmp slt i32 [[TMP1]], [[TMP2]]
; NONE-NEXT: ret i1 [[T31]]
;
; ONLY64-LABEL: @cmp(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i64
; ONLY64-NEXT: [[T31:%.*]] = icmp slt i64 [[TMP1]], [[TMP2]]
; ONLY64-NEXT: ret i1 [[T31]]
;
; MULTIPLE-LABEL: @cmp(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i16
; MULTIPLE-NEXT: [[T31:%.*]] = icmp slt i16 [[TMP1]], [[TMP2]]
; MULTIPLE-NEXT: ret i1 [[T31]]
; CHECK-LABEL: @cmp(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; CHECK-NEXT: [[T31:%.*]] = icmp slt i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i1 [[T31]]
;
%t1 = uitofp i8 %a to float
%t2 = uitofp i8 %b to float
Expand All @@ -119,27 +70,12 @@ define i32 @simple4(i32 %a) {
}

define i32 @simple5(i8 %a, i8 %b) {
; NONE-LABEL: @simple5(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; NONE-NEXT: [[T31:%.*]] = add i32 [[TMP1]], 1
; NONE-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; NONE-NEXT: ret i32 [[T42]]
;
; ONLY64-LABEL: @simple5(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i64
; ONLY64-NEXT: [[T31:%.*]] = add i64 [[TMP1]], 1
; ONLY64-NEXT: [[T42:%.*]] = mul i64 [[T31]], [[TMP2]]
; ONLY64-NEXT: [[TMP3:%.*]] = trunc i64 [[T42]] to i32
; ONLY64-NEXT: ret i32 [[TMP3]]
;
; MULTIPLE-LABEL: @simple5(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; MULTIPLE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; MULTIPLE-NEXT: [[T31:%.*]] = add i32 [[TMP1]], 1
; MULTIPLE-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; MULTIPLE-NEXT: ret i32 [[T42]]
; CHECK-LABEL: @simple5(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; CHECK-NEXT: [[T31:%.*]] = add i32 [[TMP1]], 1
; CHECK-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; CHECK-NEXT: ret i32 [[T42]]
;
%t1 = uitofp i8 %a to float
%t2 = uitofp i8 %b to float
Expand All @@ -150,27 +86,12 @@ define i32 @simple5(i8 %a, i8 %b) {
}

define i32 @simple6(i8 %a, i8 %b) {
; NONE-LABEL: @simple6(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; NONE-NEXT: [[T31:%.*]] = sub i32 0, [[TMP1]]
; NONE-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; NONE-NEXT: ret i32 [[T42]]
;
; ONLY64-LABEL: @simple6(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i64
; ONLY64-NEXT: [[T31:%.*]] = sub i64 0, [[TMP1]]
; ONLY64-NEXT: [[T42:%.*]] = mul i64 [[T31]], [[TMP2]]
; ONLY64-NEXT: [[TMP3:%.*]] = trunc i64 [[T42]] to i32
; ONLY64-NEXT: ret i32 [[TMP3]]
;
; MULTIPLE-LABEL: @simple6(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; MULTIPLE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; MULTIPLE-NEXT: [[T31:%.*]] = sub i32 0, [[TMP1]]
; MULTIPLE-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; MULTIPLE-NEXT: ret i32 [[T42]]
; CHECK-LABEL: @simple6(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; CHECK-NEXT: [[T31:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: [[T42:%.*]] = mul i32 [[T31]], [[TMP2]]
; CHECK-NEXT: ret i32 [[T42]]
;
%t1 = uitofp i8 %a to float
%t2 = uitofp i8 %b to float
Expand All @@ -184,37 +105,15 @@ define i32 @simple6(i8 %a, i8 %b) {
; cause failure of the other.

define i32 @multi1(i8 %a, i8 %b, i8 %c, float %d) {
; NONE-LABEL: @multi1(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; NONE-NEXT: [[FC:%.*]] = uitofp i8 [[C:%.*]] to float
; NONE-NEXT: [[X1:%.*]] = add i32 [[TMP1]], [[TMP2]]
; NONE-NEXT: [[Z:%.*]] = fadd float [[FC]], [[D:%.*]]
; NONE-NEXT: [[W:%.*]] = fptoui float [[Z]] to i32
; NONE-NEXT: [[R:%.*]] = add i32 [[X1]], [[W]]
; NONE-NEXT: ret i32 [[R]]
;
; ONLY64-LABEL: @multi1(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i64
; ONLY64-NEXT: [[FC:%.*]] = uitofp i8 [[C:%.*]] to float
; ONLY64-NEXT: [[X1:%.*]] = add i64 [[TMP1]], [[TMP2]]
; ONLY64-NEXT: [[TMP3:%.*]] = trunc i64 [[X1]] to i32
; ONLY64-NEXT: [[Z:%.*]] = fadd float [[FC]], [[D:%.*]]
; ONLY64-NEXT: [[W:%.*]] = fptoui float [[Z]] to i32
; ONLY64-NEXT: [[R:%.*]] = add i32 [[TMP3]], [[W]]
; ONLY64-NEXT: ret i32 [[R]]
;
; MULTIPLE-LABEL: @multi1(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i16
; MULTIPLE-NEXT: [[FC:%.*]] = uitofp i8 [[C:%.*]] to float
; MULTIPLE-NEXT: [[X1:%.*]] = add i16 [[TMP1]], [[TMP2]]
; MULTIPLE-NEXT: [[TMP3:%.*]] = zext i16 [[X1]] to i32
; MULTIPLE-NEXT: [[Z:%.*]] = fadd float [[FC]], [[D:%.*]]
; MULTIPLE-NEXT: [[W:%.*]] = fptoui float [[Z]] to i32
; MULTIPLE-NEXT: [[R:%.*]] = add i32 [[TMP3]], [[W]]
; MULTIPLE-NEXT: ret i32 [[R]]
; CHECK-LABEL: @multi1(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = zext i8 [[B:%.*]] to i32
; CHECK-NEXT: [[FC:%.*]] = uitofp i8 [[C:%.*]] to float
; CHECK-NEXT: [[X1:%.*]] = add i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: [[Z:%.*]] = fadd float [[FC]], [[D:%.*]]
; CHECK-NEXT: [[W:%.*]] = fptoui float [[Z]] to i32
; CHECK-NEXT: [[R:%.*]] = add i32 [[X1]], [[W]]
; CHECK-NEXT: ret i32 [[R]]
;
%fa = uitofp i8 %a to float
%fb = uitofp i8 %b to float
Expand All @@ -228,22 +127,11 @@ define i32 @multi1(i8 %a, i8 %b, i8 %c, float %d) {
}

define i16 @simple_negzero(i8 %a) {
; NONE-LABEL: @simple_negzero(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[T21:%.*]] = add i32 [[TMP1]], 0
; NONE-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; NONE-NEXT: ret i16 [[TMP2]]
;
; ONLY64-LABEL: @simple_negzero(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[T21:%.*]] = add i64 [[TMP1]], 0
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[T21]] to i16
; ONLY64-NEXT: ret i16 [[TMP2]]
;
; MULTIPLE-LABEL: @simple_negzero(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[T21:%.*]] = add i16 [[TMP1]], 0
; MULTIPLE-NEXT: ret i16 [[T21]]
; CHECK-LABEL: @simple_negzero(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[T21:%.*]] = add i32 [[TMP1]], 0
; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; CHECK-NEXT: ret i16 [[TMP2]]
;
%t1 = uitofp i8 %a to float
%t2 = fadd fast float %t1, -0.0
Expand All @@ -252,26 +140,12 @@ define i16 @simple_negzero(i8 %a) {
}

define i32 @simple_negative(i8 %call) {
; NONE-LABEL: @simple_negative(
; NONE-NEXT: [[TMP1:%.*]] = sext i8 [[CALL:%.*]] to i32
; NONE-NEXT: [[MUL1:%.*]] = mul i32 [[TMP1]], -3
; NONE-NEXT: [[TMP2:%.*]] = trunc i32 [[MUL1]] to i8
; NONE-NEXT: [[CONV3:%.*]] = sext i8 [[TMP2]] to i32
; NONE-NEXT: ret i32 [[CONV3]]
;
; ONLY64-LABEL: @simple_negative(
; ONLY64-NEXT: [[TMP1:%.*]] = sext i8 [[CALL:%.*]] to i64
; ONLY64-NEXT: [[MUL1:%.*]] = mul i64 [[TMP1]], -3
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[MUL1]] to i8
; ONLY64-NEXT: [[CONV3:%.*]] = sext i8 [[TMP2]] to i32
; ONLY64-NEXT: ret i32 [[CONV3]]
;
; MULTIPLE-LABEL: @simple_negative(
; MULTIPLE-NEXT: [[TMP1:%.*]] = sext i8 [[CALL:%.*]] to i16
; MULTIPLE-NEXT: [[MUL1:%.*]] = mul i16 [[TMP1]], -3
; MULTIPLE-NEXT: [[TMP2:%.*]] = trunc i16 [[MUL1]] to i8
; MULTIPLE-NEXT: [[CONV3:%.*]] = sext i8 [[TMP2]] to i32
; MULTIPLE-NEXT: ret i32 [[CONV3]]
; CHECK-LABEL: @simple_negative(
; CHECK-NEXT: [[TMP1:%.*]] = sext i8 [[CALL:%.*]] to i32
; CHECK-NEXT: [[MUL1:%.*]] = mul i32 [[TMP1]], -3
; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[MUL1]] to i8
; CHECK-NEXT: [[CONV3:%.*]] = sext i8 [[TMP2]] to i32
; CHECK-NEXT: ret i32 [[CONV3]]
;
%conv1 = sitofp i8 %call to float
%mul = fmul float %conv1, -3.000000e+00
Expand All @@ -281,22 +155,11 @@ define i32 @simple_negative(i8 %call) {
}

define i16 @simple_fneg(i8 %a) {
; NONE-LABEL: @simple_fneg(
; NONE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; NONE-NEXT: [[T21:%.*]] = sub i32 0, [[TMP1]]
; NONE-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; NONE-NEXT: ret i16 [[TMP2]]
;
; ONLY64-LABEL: @simple_fneg(
; ONLY64-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i64
; ONLY64-NEXT: [[T21:%.*]] = sub i64 0, [[TMP1]]
; ONLY64-NEXT: [[TMP2:%.*]] = trunc i64 [[T21]] to i16
; ONLY64-NEXT: ret i16 [[TMP2]]
;
; MULTIPLE-LABEL: @simple_fneg(
; MULTIPLE-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i16
; MULTIPLE-NEXT: [[T21:%.*]] = sub i16 0, [[TMP1]]
; MULTIPLE-NEXT: ret i16 [[T21]]
; CHECK-LABEL: @simple_fneg(
; CHECK-NEXT: [[TMP1:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: [[T21:%.*]] = sub i32 0, [[TMP1]]
; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[T21]] to i16
; CHECK-NEXT: ret i16 [[TMP2]]
;
%t1 = uitofp i8 %a to float
%t2 = fneg fast float %t1
Expand Down

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