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9cee708dfc
SUMMARY:
when we call memset, memcopy,memmove etc(this are llvm intrinsic function) in the c source code. the llvm will generate IR
like call call void @llvm.memset.p0i8.i32(i8* align 4 bitcast (%struct.S* @s to i8*), i8 %1, i32 %2, i1 false)
for c source code
bash> cat test_memset.call
struct S{
int a;
int b;
};
extern struct S s;
void bar() {
memset(&s, s.b, s.b);
}
like
%struct.S = type { i32, i32 }
@s = external global %struct.S, align 4
; Function Attrs: noinline nounwind optnone
define void @bar() #0 {
entry:
%0 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
%1 = trunc i32 %0 to i8
%2 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
call void @llvm.memset.p0i8.i32(i8* align 4 bitcast (%struct.S* @s to i8*), i8 %1, i32 %2, i1 false)
ret void
}
declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1 immarg) #1
If we want to let the aix as assembly compile pass without -u
it need to has following assembly code.
.extern .memset
(we do not output extern linkage for llvm instrinsic function.
even if we output the extern linkage for llvm intrinsic function, we should not out .extern llvm.memset.p0i8.i32,
instead of we should emit .extern memset)
for other llvm buildin function floatdidf . even if we do not call these function floatdidf in the c source code(the generated IR also do not the call __floatdidf . the function call
was generated in the LLVM optimized.
the function is not in the functions list of Module, but we still need to emit extern .__floatdidf
The solution for it as :
We record all the lllvm intrinsic extern symbol when transformCallee(), and emit all these symbol in the AsmPrinter::doFinalization(Module &M)
Reviewers: jasonliu, Sean Fertile, hubert.reinterpretcast,
Differential Revision: https://reviews.llvm.org/D78929
71 lines
3.0 KiB
LLVM
71 lines
3.0 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -mcpu=pwr4 -mattr=-altivec < %s | \
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; RUN: FileCheck %s
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; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff -mcpu=pwr4 -mattr=-altivec < %s | \
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; RUN: FileCheck %s
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; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -mcpu=pwr4 \
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; RUN: -mattr=-altivec -filetype=obj -o %t.o < %s
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; RUN: llvm-readobj --symbols %t.o | FileCheck --check-prefix=CHECKSYM %s
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; RUN: llvm-objdump -r -d --symbol-description %t.o | FileCheck --check-prefix=CHECKRELOC %s
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; RUN: not --crash llc -verify-machineinstrs -mcpu=pwr4 -mtriple powerpc64-ibm-aix-xcoff \
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; RUN: -mattr=-altivec -filetype=obj -o %t.o 2>&1 < %s | \
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; RUN: FileCheck --check-prefix=XCOFF64 %s
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; XCOFF64: LLVM ERROR: 64-bit XCOFF object files are not supported yet.
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%struct.S = type { i32, i32 }
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@s = external global %struct.S, align 4
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define void @bar() {
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entry:
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%0 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
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%1 = trunc i32 %0 to i8
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%2 = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @s, i32 0, i32 1), align 4
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call void @llvm.memset.p0i8.i32(i8* align 4 bitcast (%struct.S* @s to i8*), i8 %1, i32 %2, i1 false)
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ret void
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}
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declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i1 immarg)
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; CHECK-LABEL: .bar:
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; CHECK-NEXT: # %bb.0: # %entry
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; CHECK-NEXT: mflr 0
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; CHECK: bl .memset
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; CHECK: .extern .memset
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; CHECKSYM: Symbol {
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; CHECKSYM-NEXT: Index: 0
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; CHECKSYM-NEXT: Name: .memset
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; CHECKSYM-NEXT: Value (RelocatableAddress): 0x0
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; CHECKSYM-NEXT: Section: N_UNDEF
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; CHECKSYM-NEXT: Type: 0x0
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; CHECKSYM-NEXT: StorageClass: C_EXT (0x2)
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; CHECKSYM-NEXT: NumberOfAuxEntries: 1
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; CHECKSYM-NEXT: CSECT Auxiliary Entry {
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; CHECKSYM-NEXT: Index: 1
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; CHECKSYM-NEXT: SectionLen: 0
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; CHECKSYM-NEXT: ParameterHashIndex: 0x0
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; CHECKSYM-NEXT: TypeChkSectNum: 0x0
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; CHECKSYM-NEXT: SymbolAlignmentLog2: 0
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; CHECKSYM-NEXT: SymbolType: XTY_ER (0x0)
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; CHECKSYM-NEXT: StorageMappingClass: XMC_PR (0x0)
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; CHECKSYM-NEXT: StabInfoIndex: 0x0
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; CHECKSYM-NEXT: StabSectNum: 0x0
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; CHECKSYM-NEXT: }
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; CHECKSYM-NEXT: }
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; CHECKRELOC: 00000000 (idx: 6) .bar:
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; CHECKRELOC-NEXT: 0: 7c 08 02 a6 mflr 0
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; CHECKRELOC-NEXT: 4: 90 01 00 08 stw 0, 8(1)
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; CHECKRELOC-NEXT: 8: 94 21 ff c0 stwu 1, -64(1)
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; CHECKRELOC-NEXT: c: 80 62 00 00 lwz 3, 0(2)
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; CHECKRELOC-NEXT: 0000000e: R_TOC (idx: 12) s[TC]
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; CHECKRELOC-NEXT: 10: 80 83 00 04 lwz 4, 4(3)
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; CHECKRELOC-NEXT: 14: 7c 85 23 78 mr 5, 4
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; CHECKRELOC-NEXT: 18: 4b ff ff e9 bl 0x0
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; CHECKRELOC-NEXT: 00000018: R_RBR (idx: 0) .memset[PR]
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