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| author | Chris Lattner <sabre@nondot.org> | 2005-08-10 16:34:52 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-08-10 16:34:52 +0000 |
| commit | 67d0753773d3cac492b9caeb474c69721696d915 (patch) | |
| tree | e94524af9ac1186026735d21b00a04b883f7eaf5 /llvm/lib/System/Program.cpp | |
| parent | 1c2f9fdf71f7b99aa871131006b0d0713cf917ce (diff) | |
| download | bcm5719-llvm-67d0753773d3cac492b9caeb474c69721696d915.tar.gz bcm5719-llvm-67d0753773d3cac492b9caeb474c69721696d915.zip | |
1. Refactored handling of integer immediate values for add, or, xor and sub.
New routine: ISel::SelectIntImmediateExpr
2. Now checking use counts of large constants. If use count is > 2 then drop
thru so that the constant gets loaded into a register.
Source:
int %test1(int %a) {
entry:
%tmp.1 = add int %a, 123456789 ; <int> [#uses=1]
%tmp.2 = or int %tmp.1, 123456789 ; <int> [#uses=1]
%tmp.3 = xor int %tmp.2, 123456789 ; <int> [#uses=1]
%tmp.4 = sub int %tmp.3, -123456789 ; <int> [#uses=1]
ret int %tmp.4
}
Did Emit:
.machine ppc970
.text
.align 2
.globl _test1
_test1:
.LBB_test1_0: ; entry
addi r2, r3, -13035
addis r2, r2, 1884
ori r2, r2, 52501
oris r2, r2, 1883
xori r2, r2, 52501
xoris r2, r2, 1883
addi r2, r2, 52501
addis r3, r2, 1883
blr
Now Emits:
.machine ppc970
.text
.align 2
.globl _test1
_test1:
.LBB_test1_0: ; entry
lis r2, 1883
ori r2, r2, 52501
add r3, r3, r2
or r3, r3, r2
xor r3, r3, r2
add r3, r3, r2
blr
Patch by Jim Laskey!
llvm-svn: 22749
Diffstat (limited to 'llvm/lib/System/Program.cpp')
0 files changed, 0 insertions, 0 deletions
