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676084e2a9
Constants are crucial for code size in the ARM Thumb-1 instruction set. The 16 bit instruction size often does not offer enough space for immediate arguments. This means that additional instructions are frequently used to load constants into registers. Since constants are hoisted, this can lead to significant register spillage if they are used multiple times in a single function. This can be avoided by rematerialization, i.e. recomputing a constant instead of reloading it from the stack. This patch fixes the rematerialization of literal pool loads in the ARM Thumb instruction set. Patch by Philip Ginsbach Differential Revision: https://reviews.llvm.org/D33936 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308004 91177308-0d34-0410-b5e6-96231b3b80d8
83 lines
1.7 KiB
LLVM
83 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=thumb-apple-darwin | FileCheck %s
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; RUN: llc < %s -mtriple=thumb-pc-linux-gnueabi | FileCheck -check-prefix=CHECK-EABI %s
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define i32 @f1(i32 %a.s) {
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entry:
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%tmp = icmp eq i32 %a.s, 4
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f1:
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; CHECK: beq
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; CHECK-EABI-LABEL: f1:
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; CHECK-EABI: beq
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define i32 @f2(i32 %a.s) {
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entry:
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%tmp = icmp sgt i32 %a.s, 4
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f2:
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; CHECK: bgt
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; CHECK-EABI-LABEL: f2:
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; CHECK-EABI: bgt
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define i32 @f3(i32 %a.s, i32 %b.s) {
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entry:
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%tmp = icmp slt i32 %a.s, %b.s
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f3:
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; CHECK: blt
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; CHECK-EABI-LABEL: f3:
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; CHECK-EABI: blt
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define i32 @f4(i32 %a.s, i32 %b.s) {
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entry:
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%tmp = icmp sle i32 %a.s, %b.s
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f4:
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; CHECK: ble
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; CHECK-EABI-LABEL: f4:
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; CHECK-EABI: ble
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define i32 @f5(i32 %a.u, i32 %b.u) {
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entry:
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%tmp = icmp ule i32 %a.u, %b.u
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f5:
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; CHECK: bls
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; CHECK-EABI-LABEL: f5:
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; CHECK-EABI: bls
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define i32 @f6(i32 %a.u, i32 %b.u) {
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entry:
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%tmp = icmp ugt i32 %a.u, %b.u
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%tmp1.s = select i1 %tmp, i32 2, i32 3
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ret i32 %tmp1.s
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}
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; CHECK-LABEL: f6:
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; CHECK: bhi
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; CHECK-EABI-LABEL: f6:
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; CHECK-EABI: bhi
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define double @f7(double %a, double %b) {
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%tmp = fcmp olt double %a, 1.234e+00
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%tmp1 = select i1 %tmp, double -1.000e+00, double %b
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ret double %tmp1
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}
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; CHECK-LABEL: f7:
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; CHECK: blt
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; CHECK: {{blt|bge}}
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; CHECK: __ltdf2
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; CHECK-EABI-LABEL: f7:
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; CHECK-EABI: __aeabi_dcmplt
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; CHECK-EABI: bne
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; CHECK-EABI: {{bne|beq}}
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