From: Michael Collison <michael.collison@linaro.org>
To: gcc-patches@gcc.gnu.org
Subject: [ARM] Optimize compare against smin/umin
Date: Thu, 25 Jun 2015 17:11:00 -0000 [thread overview]
Message-ID: <558C3576.3070108@linaro.org> (raw)
This patch is designed to optimize constructs such as:
#define min(x, y) ((x) <= (y)) ? (x) : (y)
unsignedint foo (unsignedint i, unsignedint x ,unsignedint y)
{
return i < (min (x, y));
}
int bar (int i,int x,int y)
{
return i < (min (x, y));
}
Patch was tested on arm-linux-gnueabi, arm-linux-gnueabihf,
armeb-linux-gnueabihf. Okay for trunk?
2015-06-24 Michael Collison <michael.collison@linaro.org
2012-05-01 Ramana Radhakrishnan <ramana.radhakrishnan@linaro.org>
* gcc/config/arm/arm.md (*arm_smin_cmp): New pattern.
(*arm_umin_cmp): Likewise.
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index 1ac8af0..994c95f 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -3455,6 +3455,28 @@
(set_attr "type" "multiple,multiple")]
)
+;; t = (s/u)min (x, y)
+;; cc = cmp (t, z)
+;; is the same as
+;; cmp x, z
+;; cmpge(u) y, z
+
+(define_insn_and_split "*arm_smin_cmp"
+ [(set (reg:CC CC_REGNUM)
+ (compare:CC
+ (smin:SI (match_operand:SI 0 "s_register_operand" "r")
+ (match_operand:SI 1 "s_register_operand" "r"))
+ (match_operand:SI 2 "s_register_operand" "r")))]
+ "TARGET_32BIT"
+ "#"
+ ""
+ [(set (reg:CC CC_REGNUM)
+ (compare:CC (match_dup 0) (match_dup 2)))
+ (cond_exec (ge:CC (reg:CC CC_REGNUM) (const_int 0))
+ (set (reg:CC CC_REGNUM)
+ (compare:CC (match_dup 1) (match_dup 2))))]
+)
+
(define_expand "umaxsi3"
[(parallel [
(set (match_operand:SI 0 "s_register_operand" "")
@@ -3521,6 +3543,22 @@
(set_attr "type" "store1")]
)
+(define_insn_and_split "*arm_umin_cmp"
+ [(set (reg:CC CC_REGNUM)
+ (compare:CC
+ (umin:SI (match_operand:SI 0 "s_register_operand" "r")
+ (match_operand:SI 1 "s_register_operand" "r"))
+ (match_operand:SI 2 "s_register_operand" "r")))]
+ "TARGET_32BIT"
+ "#"
+ ""
+ [(set (reg:CC CC_REGNUM)
+ (compare:CC (match_dup 0) (match_dup 2)))
+ (cond_exec (geu:CC (reg:CC CC_REGNUM) (const_int 0))
+ (set (reg:CC CC_REGNUM)
+ (compare:CC (match_dup 1) (match_dup 2))))]
+)
+
(define_insn "*store_minmaxsi"
[(set (match_operand:SI 0 "memory_operand" "=m")
(match_operator:SI 3 "minmax_operator"
--
Michael Collison
Linaro Toolchain Working Group
michael.collison@linaro.org
next reply other threads:[~2015-06-25 17:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-25 17:11 Michael Collison [this message]
2015-07-13 11:27 ` Ramana Radhakrishnan
2015-07-27 1:06 ` Michael Collison
2015-07-27 8:48 ` Kyrill Tkachov
2015-08-03 7:57 ` Christophe Lyon
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