mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
81b28ceab6
- Recognize expressions like "x > -1 ? x : 0" as min/max and turn them into expressions like "x < 0 ? 0 : x", which is easily recognizable as a min/max operation. - Refrain from folding expression like "y/2 < 1" to "y < 2" when the comparison is being used as part of a min or max idiom, like "y/2 < 1 ? 1 : y/2". In that case, the division has another use, so folding doesn't eliminate it, and obfuscates the min/max, making it harder to recognize as a min/max operation. These benefit ScalarEvolution, CodeGen, and anything else that wants to recognize integer min and max. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56246 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
1.8 KiB
LLVM
86 lines
1.8 KiB
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {icmp s\[lg\]t i32 %n, 0} | count 16
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; Instcombine should recognize that this code can be adjusted
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; to fit the canonical smax/smin pattern.
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define i32 @floor_a(i32 %n) {
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%t = icmp sgt i32 %n, -1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_a(i32 %n) {
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%t = icmp slt i32 %n, 1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_b(i32 %n) {
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%t = icmp sgt i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_b(i32 %n) {
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%t = icmp slt i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_c(i32 %n) {
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%t = icmp sge i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_c(i32 %n) {
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%t = icmp sle i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_d(i32 %n) {
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%t = icmp sge i32 %n, 1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_d(i32 %n) {
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%t = icmp sle i32 %n, -1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_e(i32 %n) {
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%t = icmp sgt i32 %n, -1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_e(i32 %n) {
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%t = icmp slt i32 %n, 1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_f(i32 %n) {
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%t = icmp sgt i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_f(i32 %n) {
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%t = icmp slt i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_g(i32 %n) {
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%t = icmp sge i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_g(i32 %n) {
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%t = icmp sle i32 %n, 0
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @floor_h(i32 %n) {
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%t = icmp sge i32 %n, 1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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define i32 @ceil_h(i32 %n) {
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%t = icmp sle i32 %n, -1
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%m = select i1 %t, i32 %n, i32 0
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ret i32 %m
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}
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