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https://github.com/c64scene-ar/llvm-6502.git
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fe8c7c807c
non-type-safe constant initializers. This sort of thing happens quite a bit for 4-byte loads out of string constants, unions, bitfields, and an interesting endianness check from sqlite, which is something like this: const int sqlite3one = 1; # define SQLITE_BIGENDIAN (*(char *)(&sqlite3one)==0) # define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1) # define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE) all of these macros now constant fold away. This implements PR3152 and is based on a patch started by Eli, but heavily modified and extended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84936 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
1.6 KiB
LLVM
69 lines
1.6 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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@test1 = constant {{i32,i8},i32} {{i32,i8} { i32 -559038737, i8 186 }, i32 -889275714 }
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@test2 = constant double 1.0
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; Simple load
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define i32 @test1() {
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%r = load i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0)
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ret i32 %r
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; @test1
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; CHECK: ret i32 -559038737
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}
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; PR3152
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; Load of first 16 bits of 32-bit value.
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define i16 @test2() {
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%r = load i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*)
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ret i16 %r
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; @test2
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; CHECK: ret i16 -16657
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}
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; Load of second 16 bits of 32-bit value.
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define i16 @test3() {
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%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*), i32 1)
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ret i16 %r
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; @test3
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; CHECK: ret i16 -8531
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}
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; Load of 8 bit field + tail padding.
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define i16 @test4() {
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%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*), i32 2)
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ret i16 %r
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; @test4
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; CHECK: ret i16 186
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}
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; Load of double bits.
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define i64 @test6() {
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%r = load i64* bitcast(double* @test2 to i64*)
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ret i64 %r
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; @test6
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; CHECK: ret i64 4607182418800017408
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}
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; Load of double bits.
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define i16 @test7() {
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%r = load i16* bitcast(double* @test2 to i16*)
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ret i16 %r
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; @test7
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; CHECK: ret i16 0
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}
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; Double load.
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define double @test8() {
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%r = load double* bitcast({{i32,i8},i32}* @test1 to double*)
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ret double %r
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; @test8
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; CHECK: ret double 0xDEADBEBA
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}
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