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74ed5d30ca
This fixes rdar://8808586 which observed that we used to compile:
union xy {
struct x { _Bool b[15]; } x;
__attribute__((packed))
struct y {
__attribute__((packed)) unsigned long b0to7;
__attribute__((packed)) unsigned int b8to11;
__attribute__((packed)) unsigned short b12to13;
__attribute__((packed)) unsigned char b14;
} y;
};
struct x
foo(union xy *xy)
{
return xy->x;
}
into:
_foo: ## @foo
movq (%rdi), %rax
movabsq $1095216660480, %rcx ## imm = 0xFF00000000
andq %rax, %rcx
movabsq $-72057594037927936, %rdx ## imm = 0xFF00000000000000
andq %rax, %rdx
movzbl %al, %esi
orq %rdx, %rsi
movq %rax, %rdx
andq $65280, %rdx ## imm = 0xFF00
orq %rsi, %rdx
movq %rax, %rsi
andq $16711680, %rsi ## imm = 0xFF0000
orq %rdx, %rsi
movl %eax, %edx
andl $-16777216, %edx ## imm = 0xFFFFFFFFFF000000
orq %rsi, %rdx
orq %rcx, %rdx
movabsq $280375465082880, %rcx ## imm = 0xFF0000000000
movq %rax, %rsi
andq %rcx, %rsi
orq %rdx, %rsi
movabsq $71776119061217280, %r8 ## imm = 0xFF000000000000
andq %r8, %rax
orq %rsi, %rax
movzwl 12(%rdi), %edx
movzbl 14(%rdi), %esi
shlq $16, %rsi
orl %edx, %esi
movq %rsi, %r9
shlq $32, %r9
movl 8(%rdi), %edx
orq %r9, %rdx
andq %rdx, %rcx
movzbl %sil, %esi
shlq $32, %rsi
orq %rcx, %rsi
movl %edx, %ecx
andl $-16777216, %ecx ## imm = 0xFFFFFFFFFF000000
orq %rsi, %rcx
movq %rdx, %rsi
andq $16711680, %rsi ## imm = 0xFF0000
orq %rcx, %rsi
movq %rdx, %rcx
andq $65280, %rcx ## imm = 0xFF00
orq %rsi, %rcx
movzbl %dl, %esi
orq %rcx, %rsi
andq %r8, %rdx
orq %rsi, %rdx
ret
We now compile this into:
_foo: ## @foo
## BB#0: ## %entry
movzwl 12(%rdi), %eax
movzbl 14(%rdi), %ecx
shlq $16, %rcx
orl %eax, %ecx
shlq $32, %rcx
movl 8(%rdi), %edx
orq %rcx, %rdx
movq (%rdi), %rax
ret
A small improvement :-)
llvm-svn: 123520
120 lines
2.5 KiB
LLVM
120 lines
2.5 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-n8:16:32:64"
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; Instcombine should be able to eliminate all of these ext casts.
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declare void @use(i32)
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define i64 @test1(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 15
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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; CHECK: @test1
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; CHECK: %d = and i64 %a, 15
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; CHECK: ret i64 %d
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}
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define i64 @test2(i64 %a) {
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%b = trunc i64 %a to i32
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%c = shl i32 %b, 4
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%q = ashr i32 %c, 4
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%d = sext i32 %q to i64
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call void @use(i32 %b)
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ret i64 %d
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; CHECK: @test2
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; CHECK: shl i64 %a, 36
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; CHECK: %d = ashr i64 {{.*}}, 36
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; CHECK: ret i64 %d
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}
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define i64 @test3(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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; CHECK: @test3
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; CHECK: %d = and i64 %a, 8
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; CHECK: ret i64 %d
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}
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define i64 @test4(i64 %a) {
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%x = xor i32 %c, 8
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%d = zext i32 %x to i64
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call void @use(i32 %b)
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ret i64 %d
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; CHECK: @test4
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; CHECK: = and i64 %a, 8
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; CHECK: %d = xor i64 {{.*}}, 8
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; CHECK: ret i64 %d
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}
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define i32 @test5(i32 %A) {
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%B = zext i32 %A to i128
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%C = lshr i128 %B, 16
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%D = trunc i128 %C to i32
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ret i32 %D
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; CHECK: @test5
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; CHECK: %C = lshr i32 %A, 16
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; CHECK: ret i32 %C
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}
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define i32 @test6(i64 %A) {
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%B = zext i64 %A to i128
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%C = lshr i128 %B, 32
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%D = trunc i128 %C to i32
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ret i32 %D
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; CHECK: @test6
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; CHECK: %C = lshr i64 %A, 32
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; CHECK: %D = trunc i64 %C to i32
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; CHECK: ret i32 %D
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}
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define i92 @test7(i64 %A) {
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%B = zext i64 %A to i128
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%C = lshr i128 %B, 32
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%D = trunc i128 %C to i92
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ret i92 %D
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; CHECK: @test7
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; CHECK: %B = zext i64 %A to i92
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; CHECK: %C = lshr i92 %B, 32
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; CHECK: ret i92 %C
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}
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define i64 @test8(i32 %A, i32 %B) {
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%tmp38 = zext i32 %A to i128
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%tmp32 = zext i32 %B to i128
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%tmp33 = shl i128 %tmp32, 32
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%ins35 = or i128 %tmp33, %tmp38
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%tmp42 = trunc i128 %ins35 to i64
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ret i64 %tmp42
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; CHECK: @test8
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; CHECK: %tmp38 = zext i32 %A to i64
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; CHECK: %tmp32 = zext i32 %B to i64
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; CHECK: %tmp33 = shl i64 %tmp32, 32
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; CHECK: %ins35 = or i64 %tmp33, %tmp38
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; CHECK: ret i64 %ins35
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}
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define i8 @test9(i32 %X) {
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%Y = and i32 %X, 42
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%Z = trunc i32 %Y to i8
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ret i8 %Z
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; CHECK: @test9
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; CHECK: trunc
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; CHECK: and
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; CHECK: ret
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}
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; rdar://8808586
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define i8 @test10(i32 %X) {
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%Y = trunc i32 %X to i8
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%Z = and i8 %Y, 42
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ret i8 %Z
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; CHECK: @test10
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; CHECK: trunc
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; CHECK: and
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; CHECK: ret
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}
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