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[COFF] Fix section name for constants larger than 64 bits on Windows 

APIntToHexString returns wrong value ("0000000000000000ffffffffffffffff")
for integer larger than 64 bits, and thus
TargetLoweringObjectFileCOFF::getSectionForConstant returns same section name
for all numbers larger than 64 bits. This patch tries to fix it.

Differential Revision: https://reviews.llvm.org/D66458
Patch by Senran Zhang

llvm-svn: 369610
This commit is contained in:
Fangrui Song 2019-08-22 01:48:34 +00:00
parent 22dc44ff89
commit 246750c2a9
2 changed files with 99 additions and 1 deletions
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3
llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -1597,7 +1597,8 @@ const MCExpr *TargetLoweringObjectFileCOFF::lowerRelativeReference(
static std::string APIntToHexString(const APInt &AI) {
unsigned Width = (AI.getBitWidth() / 8) * 2;
std::string HexString = utohexstr(AI.getLimitedValue(), /*LowerCase=*/true);
std::string HexString = AI.toString(16, /*Signed=*/false);
transform(HexString.begin(), HexString.end(), HexString.begin(), tolower);
unsigned Size = HexString.size();
assert(Width >= Size && "hex string is too large!");
HexString.insert(HexString.begin(), Width - Size, '0');

97
llvm/test/CodeGen/X86/coff-fp-section-name.ll Normal file
View File

@ -0,0 +1,97 @@
; RUN: llc -O0 < %s | FileCheck %s
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc"
define dso_local i32 @main() #0 {
entry:
%retval = alloca i32, align 4
%a = alloca fp128, align 16
%b = alloca fp128, align 16
%c = alloca fp128, align 16
%d = alloca fp128, align 16
%e = alloca fp128, align 16
%f = alloca fp128, align 16
%g = alloca fp128, align 16
%h = alloca float, align 4
%i = alloca float, align 4
%j = alloca float, align 4
%k = alloca float, align 4
%l = alloca double, align 8
%m = alloca double, align 8
%n = alloca double, align 8
%o = alloca double, align 8
store i32 0, i32* %retval, align 4
store fp128 0xLBB2C11D0AE2E087D73E717A35985531C, fp128* %a, align 16
store fp128 0xLBB2C11D0AE2E087D73E717A35985531C, fp128* %b, align 16
store fp128 0xL00000000000000004002000000000000, fp128* %c, align 16
store fp128 0xL00000000000000007FFF800000000000, fp128* %d, align 16
store fp128 0xL00000000000000007FFF000000000000, fp128* %e, align 16
store fp128 0xL00000000000000007FFF000000000000, fp128* %f, align 16
store fp128 0xL10000000000000003F66244CE242C556, fp128* %g, align 16
store float 0x3E212E0BE0000000, float* %h, align 4
store float 8.000000e+00, float* %i, align 4
store float 0x7FF8000000000000, float* %j, align 4
store float 0x7FF0000000000000, float* %k, align 4
store double 1.000000e+00, double* %l, align 8
store double 8.000000e+00, double* %m, align 8
store double 0x7FF8000000000000, double* %n, align 8
store double 0x7FF0000000000000, double* %o, align 8
ret i32 0
}
attributes #0 = { "target-features"="+mmx" }
; %o
; CHECK: .globl __real@7ff0000000000000
; CHECK: .section .rdata,"dr",discard,__real@7ff0000000000000
; %n
; CHECK: .globl __real@7ff8000000000000
; CHECK: .section .rdata,"dr",discard,__real@7ff8000000000000
; %m
; CHECK: .globl __real@4020000000000000
; CHECK: .section .rdata,"dr",discard,__real@4020000000000000
; %l
; CHECK: .globl __real@3ff0000000000000
; CHECK: .section .rdata,"dr",discard,__real@3ff0000000000000
; %j
; CHECK: .globl __real@7f800000
; CHECK: .section .rdata,"dr",discard,__real@7f800000
; %k
; CHECK: .globl __real@7fc00000
; CHECK: .section .rdata,"dr",discard,__real@7fc00000
; %i
; CHECK: .globl __real@41000000
; CHECK: .section .rdata,"dr",discard,__real@41000000
; %h
; CHECK: .globl __real@3109705f
; CHECK: .section .rdata,"dr",discard,__real@3109705f
; %a, %b
; CHECK: .globl __xmm@73e717a35985531cbb2c11d0ae2e087d
; CHECK: .section .rdata,"dr",discard,__xmm@73e717a35985531cbb2c11d0ae2e087d
; %c
; CHECK: .globl __xmm@40020000000000000000000000000000
; CHECK: .section .rdata,"dr",discard,__xmm@40020000000000000000000000000000
; %d
; CHECK: .globl __xmm@7fff8000000000000000000000000000
; CHECK: .section .rdata,"dr",discard,__xmm@7fff8000000000000000000000000000
; %e, %f
; CHECK: .globl __xmm@7fff0000000000000000000000000000
; CHECK: .section .rdata,"dr",discard,__xmm@7fff0000000000000000000000000000
; %g
; CHECK: .globl __xmm@3f66244ce242c5561000000000000000
; CHECK: .section .rdata,"dr",discard,__xmm@3f66244ce242c5561000000000000000