[llvm] f134fc4 - Reland "[SLC] sprintf(dst, "%s", str) -> strcpy(dst, str)"
Dávid Bolvanský via llvm-commits
llvm-commits at lists.llvm.org
Sat Aug 15 03:15:20 PDT 2020
Author: Dávid Bolvanský
Date: 2020-08-15T12:14:57+02:00
New Revision: f134fc4f1b8ceac38a6c170d7adf486742e6eb2f
URL: https://github.com/llvm/llvm-project/commit/f134fc4f1b8ceac38a6c170d7adf486742e6eb2f
DIFF: https://github.com/llvm/llvm-project/commit/f134fc4f1b8ceac38a6c170d7adf486742e6eb2f.diff
LOG: Reland "[SLC] sprintf(dst, "%s", str) -> strcpy(dst, str)"
Added:
Modified:
llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
llvm/test/Transforms/InstCombine/2010-05-30-memcpy-Struct.ll
llvm/test/Transforms/InstCombine/sprintf-1.ll
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 160161f55b02..78a52c992e9f 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -2496,6 +2496,30 @@ Value *LibCallSimplifier::optimizeSPrintFString(CallInst *CI,
if (!CI->getArgOperand(2)->getType()->isPointerTy())
return nullptr;
+ if (CI->use_empty())
+ // sprintf(dest, "%s", str) -> strcpy(dest, str)
+ return emitStrCpy(CI->getArgOperand(0), CI->getArgOperand(2), B, TLI);
+
+ uint64_t SrcLen = GetStringLength(CI->getArgOperand(2));
+ if (SrcLen) {
+ B.CreateMemCpy(
+ CI->getArgOperand(0), Align(1), CI->getArgOperand(2), Align(1),
+ ConstantInt::get(DL.getIntPtrType(CI->getContext()), SrcLen));
+ // Returns total number of characters written without null-character.
+ return ConstantInt::get(CI->getType(), SrcLen - 1);
+ } else if (Value *V = emitStpCpy(CI->getArgOperand(0), CI->getArgOperand(2),
+ B, TLI)) {
+ // sprintf(dest, "%s", str) -> stpcpy(dest, str) - dest
+ Value *PtrDiff = B.CreatePtrDiff(V, CI->getArgOperand(0));
+ return B.CreateIntCast(PtrDiff, CI->getType(), false);
+ }
+
+ bool OptForSize = CI->getFunction()->hasOptSize() ||
+ llvm::shouldOptimizeForSize(CI->getParent(), PSI, BFI,
+ PGSOQueryType::IRPass);
+ if (OptForSize)
+ return nullptr;
+
Value *Len = emitStrLen(CI->getArgOperand(2), B, DL, TLI);
if (!Len)
return nullptr;
diff --git a/llvm/test/Transforms/InstCombine/2010-05-30-memcpy-Struct.ll b/llvm/test/Transforms/InstCombine/2010-05-30-memcpy-Struct.ll
index 51610698c244..e3cf763917a0 100644
--- a/llvm/test/Transforms/InstCombine/2010-05-30-memcpy-Struct.ll
+++ b/llvm/test/Transforms/InstCombine/2010-05-30-memcpy-Struct.ll
@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
; PR7265
@@ -9,10 +10,14 @@ target triple = "x86_64-unknown-linux-gnu"
@.str = private constant [3 x i8] c"%s\00"
define void @CopyEventArg(%union.anon* %ev) nounwind {
+; CHECK-LABEL: @CopyEventArg(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[CSTR:%.*]] = bitcast %union.anon* [[EV:%.*]] to i8*
+; CHECK-NEXT: [[STRCPY:%.*]] = call i8* @strcpy(i8* nonnull dereferenceable(1) undef, i8* nonnull dereferenceable(1) [[CSTR]])
+; CHECK-NEXT: ret void
+;
entry:
%call = call i32 (i8*, i8*, ...) @sprintf(i8* undef, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), %union.anon* %ev) nounwind
-; CHECK: bitcast %union.anon* %ev to i8*
-; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
ret void
}
diff --git a/llvm/test/Transforms/InstCombine/sprintf-1.ll b/llvm/test/Transforms/InstCombine/sprintf-1.ll
index 9dbfecaecb31..67a4f8a2d30c 100644
--- a/llvm/test/Transforms/InstCombine/sprintf-1.ll
+++ b/llvm/test/Transforms/InstCombine/sprintf-1.ll
@@ -2,7 +2,8 @@
; Test that the sprintf library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
-; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefix=CHECK-IPRINTF
+; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefixes=CHECK,CHECK-IPRINTF
+; RUN: opt < %s -mtriple=i386-pc-windows-msvc -instcombine -S | FileCheck %s --check-prefixes=CHECK,WIN
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@@ -23,10 +24,6 @@ define void @test_simplify1(i8* %dst) {
; CHECK-LABEL: @test_simplify1(
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(13) [[DST:%.*]], i8* nonnull align 1 dereferenceable(13) getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0), i32 13, i1 false)
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_simplify1(
-; CHECK-IPRINTF-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(13) [[DST:%.*]], i8* nonnull align 1 dereferenceable(13) getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0), i32 13, i1 false)
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt)
@@ -37,10 +34,6 @@ define void @test_simplify2(i8* %dst) {
; CHECK-LABEL: @test_simplify2(
; CHECK-NEXT: store i8 0, i8* [[DST:%.*]], align 1
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_simplify2(
-; CHECK-IPRINTF-NEXT: store i8 0, i8* [[DST:%.*]], align 1
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt)
@@ -51,10 +44,6 @@ define void @test_simplify3(i8* %dst) {
; CHECK-LABEL: @test_simplify3(
; CHECK-NEXT: store i8 0, i8* [[DST:%.*]], align 1
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_simplify3(
-; CHECK-IPRINTF-NEXT: store i8 0, i8* [[DST:%.*]], align 1
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [7 x i8], [7 x i8]* @null_hello, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt)
@@ -69,32 +58,18 @@ define void @test_simplify4(i8* %dst) {
; CHECK-NEXT: [[NUL:%.*]] = getelementptr i8, i8* [[DST]], i32 1
; CHECK-NEXT: store i8 0, i8* [[NUL]], align 1
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_simplify4(
-; CHECK-IPRINTF-NEXT: store i8 104, i8* [[DST:%.*]], align 1
-; CHECK-IPRINTF-NEXT: [[NUL:%.*]] = getelementptr i8, i8* [[DST]], i32 1
-; CHECK-IPRINTF-NEXT: store i8 0, i8* [[NUL]], align 1
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [3 x i8], [3 x i8]* @percent_c, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8 104)
ret void
}
-; Check sprintf(dst, "%s", str) -> llvm.memcpy(dest, str, strlen(str) + 1, 1).
+; Check sprintf(dst, "%s", str) -> strcpy(dst, "%s", str) if result is unused.
define void @test_simplify5(i8* %dst, i8* %str) {
; CHECK-LABEL: @test_simplify5(
-; CHECK-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* nonnull dereferenceable(1) [[STR:%.*]])
-; CHECK-NEXT: [[LENINC:%.*]] = add i32 [[STRLEN]], 1
-; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DST:%.*]], i8* align 1 [[STR]], i32 [[LENINC]], i1 false)
+; CHECK-NEXT: [[STRCPY:%.*]] = call i8* @strcpy(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) [[STR:%.*]])
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_simplify5(
-; CHECK-IPRINTF-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* nonnull dereferenceable(1) [[STR:%.*]])
-; CHECK-IPRINTF-NEXT: [[LENINC:%.*]] = add i32 [[STRLEN]], 1
-; CHECK-IPRINTF-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DST:%.*]], i8* align 1 [[STR]], i32 [[LENINC]], i1 false)
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [3 x i8], [3 x i8]* @percent_s, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8* %str)
@@ -104,27 +79,77 @@ define void @test_simplify5(i8* %dst, i8* %str) {
; Check sprintf(dst, format, ...) -> siprintf(str, format, ...) if no floating.
define void @test_simplify6(i8* %dst) {
-; CHECK-LABEL: @test_simplify6(
-; CHECK-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @percent_d, i32 0, i32 0), i32 187)
-; CHECK-NEXT: ret void
-;
; CHECK-IPRINTF-LABEL: @test_simplify6(
; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @siprintf(i8* [[DST:%.*]], i8* getelementptr inbounds ([3 x i8], [3 x i8]* @percent_d, i32 0, i32 0), i32 187)
; CHECK-IPRINTF-NEXT: ret void
+;
+; WIN-LABEL: @test_simplify6(
+; WIN-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @percent_d, i32 0, i32 0), i32 187)
+; WIN-NEXT: ret void
;
%fmt = getelementptr [3 x i8], [3 x i8]* @percent_d, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i32 187)
ret void
}
+; Check sprintf(dst, "%s", str) -> llvm.memcpy(dest, str, strlen(str) + 1, 1).
+
+define i32 @test_simplify7(i8* %dst, i8* %str) {
+; CHECK-IPRINTF-LABEL: @test_simplify7(
+; CHECK-IPRINTF-NEXT: [[STPCPY:%.*]] = call i8* @stpcpy(i8* [[DST:%.*]], i8* [[STR:%.*]])
+; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = ptrtoint i8* [[STPCPY]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP2:%.*]] = ptrtoint i8* [[DST]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP3:%.*]] = sub i32 [[TMP1]], [[TMP2]]
+; CHECK-IPRINTF-NEXT: ret i32 [[TMP3]]
+;
+; WIN-LABEL: @test_simplify7(
+; WIN-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* nonnull dereferenceable(1) [[STR:%.*]])
+; WIN-NEXT: [[LENINC:%.*]] = add i32 [[STRLEN]], 1
+; WIN-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DST:%.*]], i8* align 1 [[STR]], i32 [[LENINC]], i1 false)
+; WIN-NEXT: ret i32 [[STRLEN]]
+;
+ %fmt = getelementptr [3 x i8], [3 x i8]* @percent_s, i32 0, i32 0
+ %r = call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8* %str)
+ ret i32 %r
+}
+
+; Check sprintf(dst, "%s", str) -> llvm.memcpy(dest, str, strlen(str) + 1, 1).
+define i32 @test_simplify8(i8* %dst) {
+; CHECK-LABEL: @test_simplify8(
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(13) [[DST:%.*]], i8* nonnull align 1 dereferenceable(13) getelementptr inbounds ([13 x i8], [13 x i8]* @hello_world, i32 0, i32 0), i32 13, i1 false)
+; CHECK-NEXT: ret i32 12
+;
+ %fmt = getelementptr [3 x i8], [3 x i8]* @percent_s, i32 0, i32 0
+ %str = getelementptr [13 x i8], [13 x i8]* @hello_world, i32 0, i32 0
+ %r = call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8* %str)
+ ret i32 %r
+}
+
+; Check sprintf(dst, "%s", str) -> stpcpy(dest, str) - dest
+
+define i32 @test_simplify9(i8* %dst, i8* %str) {
+; CHECK-IPRINTF-LABEL: @test_simplify9(
+; CHECK-IPRINTF-NEXT: [[STPCPY:%.*]] = call i8* @stpcpy(i8* [[DST:%.*]], i8* [[STR:%.*]])
+; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = ptrtoint i8* [[STPCPY]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP2:%.*]] = ptrtoint i8* [[DST]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP3:%.*]] = sub i32 [[TMP1]], [[TMP2]]
+; CHECK-IPRINTF-NEXT: ret i32 [[TMP3]]
+;
+; WIN-LABEL: @test_simplify9(
+; WIN-NEXT: [[STRLEN:%.*]] = call i32 @strlen(i8* nonnull dereferenceable(1) [[STR:%.*]])
+; WIN-NEXT: [[LENINC:%.*]] = add i32 [[STRLEN]], 1
+; WIN-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 [[DST:%.*]], i8* align 1 [[STR]], i32 [[LENINC]], i1 false)
+; WIN-NEXT: ret i32 [[STRLEN]]
+;
+ %fmt = getelementptr [3 x i8], [3 x i8]* @percent_s, i32 0, i32 0
+ %r = call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8* %str)
+ ret i32 %r
+}
+
define void @test_no_simplify1(i8* %dst) {
; CHECK-LABEL: @test_no_simplify1(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @percent_f, i32 0, i32 0), double 1.870000e+00)
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_no_simplify1(
-; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @percent_f, i32 0, i32 0), double 1.870000e+00)
-; CHECK-IPRINTF-NEXT: ret void
;
%fmt = getelementptr [3 x i8], [3 x i8]* @percent_f, i32 0, i32 0
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, double 1.87)
@@ -135,11 +160,24 @@ define void @test_no_simplify2(i8* %dst, i8* %fmt, double %d) {
; CHECK-LABEL: @test_no_simplify2(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) [[FMT:%.*]], double [[D:%.*]])
; CHECK-NEXT: ret void
-;
-; CHECK-IPRINTF-LABEL: @test_no_simplify2(
-; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) [[FMT:%.*]], double [[D:%.*]])
-; CHECK-IPRINTF-NEXT: ret void
;
call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, double %d)
ret void
}
+
+define i32 @test_no_simplify3(i8* %dst, i8* %str) minsize {
+; CHECK-IPRINTF-LABEL: @test_no_simplify3(
+; CHECK-IPRINTF-NEXT: [[STPCPY:%.*]] = call i8* @stpcpy(i8* [[DST:%.*]], i8* [[STR:%.*]])
+; CHECK-IPRINTF-NEXT: [[TMP1:%.*]] = ptrtoint i8* [[STPCPY]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP2:%.*]] = ptrtoint i8* [[DST]] to i32
+; CHECK-IPRINTF-NEXT: [[TMP3:%.*]] = sub i32 [[TMP1]], [[TMP2]]
+; CHECK-IPRINTF-NEXT: ret i32 [[TMP3]]
+;
+; WIN-LABEL: @test_no_simplify3(
+; WIN-NEXT: [[R:%.*]] = call i32 (i8*, i8*, ...) @sprintf(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @percent_s, i32 0, i32 0), i8* [[STR:%.*]])
+; WIN-NEXT: ret i32 [[R]]
+;
+ %fmt = getelementptr [3 x i8], [3 x i8]* @percent_s, i32 0, i32 0
+ %r = call i32 (i8*, i8*, ...) @sprintf(i8* %dst, i8* %fmt, i8* %str)
+ ret i32 %r
+}
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